SMTP is a protocol built upon TCP/IP, used for outgoing email transmissions, and email relaying. It uses ports 25 (clear) and 465 (SSL) by default.

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486 views

Trying to use TLS SMTP against Exim, getting Security Error back; what's wrong?

OS: FreeBSD9 64 Bit MTA: EXIM4 with TLS with Self Signed Certificate. I am using telnet myserver.com 25 EHLO dummy@dummy.com STARTTLS It says TLS go ahead And then I issue MSG FROM: ...
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17 views

OpenVPN block SMTP Access Server completely

I've tried almost all iptables rules to block smtp on openvpn server but still clients clients can access remote smtp servers on port 25. I'm using openvpn access server. It's creating two interfaces ...
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0answers
17 views

`SMTP session failed: 501 5.5.4 connection. dafafkKHJDHJSnaf.50 - gsmp` error in mutt

My mutt was working fine a week ago. Suddenly it has stopped working with gmail. It throws the following error: SMTP session failed: 501 5.5.4 connection. v9sm74425825pfi.50 - gsmtp When I postpone ...
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2answers
3k views

SMTP issues - unable to connect : CentOS 6.5, Postfix, Dovecot, MySQL

I'm trying to setup an email server on a CentOS system with Postfix, Dovecot and MySQL. I'm following this article for an Ubuntu system: ...
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1answer
2k views

mailx: nss-config-dir=/etc/pki/nssdb/: No such file or directory

I am trying to send email using mailx using remote SMTP server (in my case it is office365 SMTP Server). Here is the command: # echo "THis is the Body of the email" | mailx -v -s "This is email ...
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1answer
69 views

Produce bounce message when Sendmail fails

I'm trying to receive a bounce mail message when an outgoing message cannot reach smtp external server (due to my local internet connection problems). I send emails using: mutt (compose) - procmail - ...
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1answer
889 views

Why use user@privatedomain@smtp.gmail.com in Mutt configuration file?

I cannot authenticate to my university smtps server with Mutt, with the same error message as http://askubuntu.com/questions/81924/sasl-authentication-failed-with-mutt-and-gmail-why/ ...
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2answers
311 views

Can I view my Microsoft Exchange Online Archive via Davmail in Thunderbird

I have successfully set up Davmail on Ubuntu 14 and am able to read, receive and send mail on my Exchange account in Thunderbird. This page was a big help!: ...
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1answer
833 views

how to find out the full path of the command from the result of lsof -i

lsof is a great utility, just now started using it. lsof -i | grep smtp => this give the following result. httpd.pl 212548 global 3u IPv4 893092369 0t0 TCP ...
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1answer
9k views

Postfix: disable authentication through port 25

When using Postfix and IMAP on a mailserver, at least 3 ports are usually opened 25 smtp : incoming emails from anybody (whole internet) 465 smtps : outgoing emails from authorized users (to the ...
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0answers
12 views

RHEL Jenkins email notifications failing

RHEL Server release 6.7 (Santiago) I know there have been multiple questions about this on SO (none of which have helped me solve my problem), but I think my problem pertains to Linux more so than it ...
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1answer
32 views

How to turn off SMTP port in Solaris

I want to turn off SMTP port in Solaris server. I am getting follwing Message. /var/adm/messages:Mar 10 06:18:08 sendmail[20024]: [ID 702911 mail.alert] /var/adm/messages:Mar 11 06:18:08 ...
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1answer
38 views

too many connection to SMTP server in exim_mainlog, How to solve it?

It is a cPanel server and from /var/log/exim_mainlog, I can see that, there are too many connections to the server. Mostly the number of action connection will be less than 25. But even after ...
2
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1answer
1k views

SMTP connectivity issue in Zenoss (“Connection unexpectedly closed”)

I am using Zenoss for monitoring purpose. I have been using its mail service for a long time. Suddenly my mail service in zenoss stopped and started showing <class ...
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1answer
26 views

what is exact meaning smtp_receive_timeout in exim.conf?

what is the exact meaning of smtp_receive_timeout in exim.conf ? Is it timeout for receiving the data after rcpt to ? Or is the total timeout for complete receiving a mail data ? Or If there is no ...
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1answer
47 views

Firewalld says a port is open, but nmap says its closed

On my CentOS 7 install I'm having trouble connecting one of my email accounts made on the server as an alias on Gmail. I have run the following commands: firewall-cmd --permanent --zone=public ...
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1answer
847 views

Emails not sending to one specific domain

We have a AWS server where emails are delivered to domains other than our own domain. I have confirm that I can send an email to my gmail account but I can't send to my hosted gmail account. So for ...
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0answers
29 views

how to find default SMTP server name?

I have a python script which uses smtplib to send out an email. I am not sure what to use for mail server name in the smtplib.SMTP initialization. On my test server I use the below and it works fine. ...
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2answers
57 views

How can I make Google Apps trust my Unix/Linux servers to send email?

I would like to use the regular mailx package's /bin/mail app to send email alerts: echo "Testing alerts from prod server" | mail -s "Example email" user@mydomain.com I control DNS for ...
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5answers
102k views

Can I set up system mail to use an external SMTP server?

Is it possible to set up system mail on a linux box to be sent via a different smtp server - maybe even with authentication? If so, how do I do this? If that's unclear, let give an example. If I'm at ...
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2answers
1k views

postfix multidomain myhostname configuration

I have two IP address running on Postfix and each IP has own domain. In short i want to isolate domain so outside folks think it is running on own IP and fully isolated even PTR also But in postfix ...
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0answers
129 views

gpg: passwordless decryption works in terminal, but not in tmux based msmtp/mutt (can't open /dev/tty)

first try: (with --no-tty in my msmtp config) (reboot) head -n 1 ~/.gnupg/gpg.conf use-agent gpg agent is started: % systemctl --user status gpg-agent.service gpg-agent.service - GnuPG private ...
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1answer
166 views

sending mail using telnet [closed]

I'm trying to send mail via the telnet command. I've looked at several tutorials online to use telnet <servername> 25. But I've tried telnet mail.aol.com 25 and it gets stuck on trying ...
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1answer
5k views

mutt SMTP TLS error sending mail

When I try to send a mail, I get the following error: gnutls_handshake: An unexpected TLS packet was received. This is my .muttrc (myname, myaddress and mymail are placeholders): # Automatically ...
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2answers
28 views

Debugging “unable to connect to sendmail server”

In a corporate environment, we have a mail server which has only ports 25/tcp and 587/tcp available. When we use Perl Scripts (using HTML::Mail) to send hundreds of legitimate mails, it occasional ...
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1answer
64 views

Postfix using external smtp server problem

I am not sure if this is the right stack exchange for my question, there are multiple stack exchange were my question might fit. I have setup my postfix configuration to send my emails through an ...
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1answer
28 views

Does SSMTP cause spam issues?

I am currently using SSMTP to send email notifications from my Icinga server. I am using my web host's STMP server to send the mail, with working authentication details [ eg icinga@domain.com ] When ...
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0answers
65 views

I use OpenSMTPD on OpenBSD 5.8! How can I automatically encrypt E-mail with OpenSMTPD

How can I automatically encrypt all outgoing E mail? My scenario: I use XXXX@gmail.com as my relay for all Emails my OpenSMTPD Server forwards All Emails to me as well as all Emails from somewhere to ...
0
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1answer
2k views

setting up a relay port for postfix smtp on CentOS 7

A CentOS 7 server has postfix, dovecot, and mailx installed. I am able to make an IMAP connection to the server from my remote Thunderbird client running on my local devbox. But I am not able to ...
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1answer
104 views

Why are my emails generated with Python stuck in mail queue

I'm trying to send emails programmatically with Python. The emails stay in the mail queue (mailq). Details are below. My diagnosing abilities have reached their limit. Perhaps the issue is my ISP ...
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3answers
8k views

Mutt not sending email when specifying smtp server

I am trying to use mutt as my email client, and it works fine for my gmail account. But when I use my work email, it does not send the emails. It doesn't give any error, it just doesn't send them. The ...
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0answers
128 views

How to enable secure authentication (ssl,tls,starttls) in nullmailer 1.0.5. and upgrade nullmailer to 1.11

I am using a linux based device where we use nullmailer to send email using smtp. nullmailer version: 1.0.5 User-Agent: Mutt/1.5.19 (2009-01-05) In the existing mechanism, our smtp server does not ...
2
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1answer
184 views

Trying to send multiple text attachments via mail message

Running this script on: "Red Had Enterprise Linux Server release 5.11 (Tikanga)" Mail is: version 8.1 6/6/93 (appears quite old). Have tried various things and cannot seem to get this to work.. ...
0
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1answer
254 views

invalid SSL_version specified at /usr/share/perl5/IO/Socket/SSL.pm line 368

SMTP SEND CRITICAL - invalid SSL_version specified at /usr/share/perl5/IO/Socket/SSL.pm line 368 I am using a nagios script /usr/lib/nagios/plugins/check_smtp_send that sends an email using gmail. ...
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0answers
118 views

Configure stunnel for smtp imaps of Gmail

hope someone could help me, i'm trying to configure stunnel on Debian system for get access to my gmail account. I have read a lot and it's seem simple but i can't figure it out. I have install and ...
0
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1answer
48 views

Is this the correct SPF DNS TXT syntax to allow the existing email servers (DNS MX records) and to authorize the new smtp server ip-address?

v=spf1 +mx ip4:65.1.2.3 -all Domain DNS TXT records to change: product1.com : sales@product1.com otherproduct.biz : sales@otherproduct.biz Information: Both domains have DNS MX records, and ...
3
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1answer
91 views

What is the correct helo for a smtp server that does not receive mail and does not have a FQDN?

What is the legal and correct helo for my SMTP server. Out going email only. Behind a NAT with no inbound ports open. SMTP server does not have a FQDN. Send mail for 2 different domains We are a ...
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0answers
20 views

Dovecot… shadow - uknown user… how do I fix this

For one user in particular I have this maillog error and the user is unable to send files using SMTP WLMX002 dovecot[1402]: auth-worker(49961): shadow(user@domain.com,X.X.X.X): unknown user How do ...
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2answers
166 views

Fetchmail with local Postfix on Home-Server

a small question... I have a fully configured postfix server which have a few domains, few users, and much more. Then I have a smart host which receives all mails and send all mails. For example ...
0
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2answers
68 views

Can I send email in the background in Mutt while still being notified of errors?

Removing mutt's send delay I originally used mutt's built-in SMTP MTA. However, there is a considerable pause after hitting send. This can be disabled by using an external MTA with set ...
0
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1answer
117 views

sendmail smtp auth simple,why fail auth?

On sendmail i did this for smtp auth sasl is running root 1609 1 0 05:16 ? 00:00:00 /usr/sbin/saslauthd -a pam -c -m /var/run/saslauthd -n 5 root 1610 1609 0 05:16 ? ...
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2answers
716 views

Exim4 550-Verification failed - how to allow any sender?

Mail sent from a daemon on my server connecting to exim4 daemon light using SMTP seems to be being frozen. In the exim4 log: 2014-10-01 09:52:19 1XZKKJ-00049R-8p <= noreply@example.com H=localhost ...
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1answer
74 views

How can I safely send email over encrypted connection from the command line?

I found the following related questions on the stackexchange network: stackoverflow - Connecting to smtp.gmail.com via command line serverfault - Using nc.exe (NetCat) to send emails to secured SMTP ...
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3answers
499 views

postfix filter incoming mails based on 'mail from' and 'rcpt to'

I want to reject emails to my postfix server based on more than one criteria, specifically I want to block emails from Russian email addresses (or that contain Cyrillic characters, but this I suspect ...
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1answer
143 views

Postfix does not work with TLS but Dovecot does

I have posted this question on Sever Fault but as soon as I mentioned that I have a control panel installed on my server (even though it has nothing to do with the issue) my question was closed. Here ...
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2answers
156 views

Where to configure my smtp server in Mutt utility

I have my smtp server -- smtp.drdb.com which is registered in DNS. I need to setup Mutt utility in my RHEL 6 server. Where should I input my smtp server details in mutt.rc file so that I can send ...
4
votes
2answers
6k views

Why I can't send mail to remote mailbox?

I have installed Postfix on my CentOS machine. I can nicely send mails to local accounts with mutt, but when I try to send one to a remote mail like myactualmail@gmail.com, I cannot understand why I ...
1
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1answer
178 views

Sendmail issues “530 Authentication required” error message when authinfo is supplied

sender_email - email address that does not exist, but must be used as FROM address, because receiver host rejects emails from other emails. receiver_email - email that is supposed to receive the sent ...
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1answer
61 views

Cannot make sendmail to use a remote SMTP server [closed]

I followed the following guide on how to setup sendmail to use a remote SMTP server and authenticate: https://www.smtp2go.com/docs/sendmail/ However, sendmail shows that it sends emails out, but ...
0
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1answer
58 views

Postfix Email Troubleshooting

I'm having some trouble changing the server I use for Postfix emails. I've installed postfix on the Linux server (CentOS 5) and setup as follows. I added the settings to the /etc/postfix/main.cf ...