Questions tagged [smtp]

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.

63 questions with no upvoted or accepted answers
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How to configure postfix to send mail to external SMTP server?

I have a machine with http://phabricator.org/ set up on it and I would like to set up postfix to enable e-mail sending to my company's mailboxes (as for notification emails coming from e.g. ...
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126 views

Tips for Troubleshooting Remote IMAP/SMTP Host Connection with OPENSSL and NMAP

I work in tech support for a company that has an email inbox integration. Users can input IMAP and SMTP host names and ports and we will attempt to open a connection with those ports and host names so ...
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246 views

How to force use SMTP servers in Alpine?

Does anybody know how to force Alpine to use a particular SMTP server from the config list? It seems to choose the first server in the SMTP list in config, but I want to be able to choose the SMTP ...
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1answer
4k views

SMTP Auth - SASL on Dovecot, Postfix and CentOS 6.2 (and Open-Xchange)

I am trying to get open SASL to work on CentOS 6.2. I followed this tutorial: http://wiki.centos.org/HowTos/postfix_sasl I suspect it works perfectly for CentOS 5.x so all I really need is an update ...
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1answer
2k 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 ...
2
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1answer
139 views

Local E-Mail sink

I do have multiple mail accounts (personal, university, work, …). Currently I'm connecting from every device (notebook, smart phone, tablet,…) to each of them via IMAP . Setting up multiple IMAP and ...
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464 views

SMTP works via Mail client but not via openssl

I'm trying to troubleshoot an SMTP issue. My credentials work fine via the OS X Mail client (and in other areas), so the credentials are definitely good. However, when I try to submit them via: ...
2
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1answer
690 views

How to configure SMTP with postfix with user and pass

I'm looking for a way to enable postfix (or any other mail delivery system) in which I can easily have aliases (user and domain aliases), and in which I can have an external user send mails through ...
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624 views

Confirm DavMail connection

I am using DavMail to connect to my employers Outlook servers. Before I attempt to configure the email client to work with DavMail, I want to confirm that DavMail has been configured properly and is ...
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1k views

Impossible to send mail to microsoft (hotmail, live …)

I cannot send mail to hotmail with my postfix server. I can send and receive mail from gmail and others, but not hotmail. I made an "Authentication Report" on auth-results@verifier.port25.com: ======...
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1answer
2k 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 'smtplib.SMTPServerDisconnected'&...
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371 views

fetchmail to log complete messages AND pass to mda

I couldn't seem to tell from the fetchmail man page or http://www.catb.org/~esr/fetchmail/fetchmail-man.html#7 whether --bsmtp <filename>.bsmtp.log, applied from cli/cronjob, and --mda <...
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483 views

Sendmail configuration with user mapping on Solaris

I have the following: host1.intra.net which has sendmail and users: user1, user2 & user3. It is running SunOS 5.10. host2.intra.net which has SMTP server. No authentication, no encryption. Email ...
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31 views

How to transform postfix in a mail trap?

To allow internal testing of a mail-intensive app, we'd like to use our actual smtp (we're using postfix & co) as a mail trap: we'd like to be able to use smtp with real mail addresses but it MUST ...
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34 views

Squid & email traffic (25)

I'm using AWS, all traffic routed out (https) via a squid Farm in an ASG to Elastic NAT gateways. I need to route smtp port 25/110 out via this route. However new to this stuff. I believe squid is ...
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743 views

CentOS 7 Firewall: How to allow SMTP outgoing emails with IPTables?

I am running a Spring-Boot Java application inside a Docker container on a server running CentOS 7. [root@dev-machine ~]# rpm --query centos-release centos-release-7-5.1804.4.el7.centos.x86_64 I ...
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185 views

I used to be able to use gmail to email a file from my linux SBC, but now I'm getting an error

I used to be able to send files using: mpack -subject <somefile> me@example.com but now I'm getting the following message: sendmail: Cannot open smtp.gmail.com:587 My /etc/ssmtp/ssmtp.conf ...
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648 views

SASL Authentication failure

Created an user with # adduser username The configuration file /etc/sysconfig/saslauthd: # Directory in which to place saslauthd's listening socket, pid file, and so # on. This directory must ...
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481 views

Centos Email Server Unable to Send Email

I have a Centos 5 box. My server is running plesk. Individual domains are able to receive emails on plesk created email accounts. However, my server is not able to send emails. I tried to use php ...
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447 views

Send mails on Ubuntu 16.04 - Failed to authenticate on SMTP server with username using 3 possible authenticators

I'm trying to send mails on my ubuntu server (from gmail). I have the Starter Cloud package from Scaleway. I have installed sendmail on my ubuntu server with the following tutorial. In my Laravel ...
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1answer
1k views

Postfix + dovecot, disable authentication on port 25

I use postfix 2.9.6 on ubuntu 12.04 (with dovecot if that matters). I'm trying to disable auth on port 25 and only allow it on port 587, so that I can receive mails normally from other servers but ...
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84 views

GUI app for sending emails through specific smtp servers

Anyone know of an application like swaks but with a GUI? Preferably the application would have auto resolve of MX for the recipient domain. The purpose would be to be able to manually send email ...
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310 views

msmtp Empty TO and FROM Field - All mail ends up in Bulk Mail when sent from CLI or manually

I have set up MSMTP with the following but if I send an e-mail from the CLI it either gets blocked, or ends up in my SPAM because it has no TO/FROM or anything up top. But e-mails from CRON are ...
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938 views

Why don't I receive mail although I get a 250 OK response?

I'm trying to send a mail with telnet. Everything seems to be OK but I don't receive the mail. Here is what I do inside my terminal on Debian 8: telnet localhost smtp 220 simon ESMTP Exim 4.84_2 Tue,...
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226 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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1answer
475 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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1k 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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1answer
623 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
219 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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995 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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347 views

Iptables - Limit SMTP output traffic

I'd like to limit the output smtp traffic of my server (Debian). For example : only 10 mails per seconds. I want to use Iptables for this purpose. I tried : iptables -A OUTPUT -p tcp --syn --dport ...
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353 views

Centos 6 and postfix: Internal emails deferred / telnet timed out from SSH

The problem is, that I have a VPS with centOS 6 installed, and I can send emails to anyone, but my own exchange server, Apr 29 11:50:30 amazonnet postfix/smtp[16535]: 2B6FF3CC49A: to=, relay=gmail-...
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1answer
487 views

exim4 on debian 7.8 sent mail never arrives @gmail

I followed the instruction on this page Debian Exim and configured my exim with a single file via the dpkg-reconfigure exim4-config setup. Now I can send mails between local users (from root to ...
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628 views

Postfix multi IP/Domain SMTP Helo'ing

We have Postfix running with two domain and each domain has own IP so it's isolated. But Spamhuaus blocked my IP and saying you are sending "localhost.localdomain" HELO I am already using ...
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1answer
127 views

how to set up my mail

I'm just trying to figure out how to use the mail command from the command shell. I've got Ubuntu 12.04 on my laptop. I've been entering the following: user@hostname:~$ mail my_email_address@domain....
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1answer
795 views

Is it safe to remove “received” header?

Is it safe to remove "received" fields created by my mail server for all outgoing mail? For example like this (all "received" headers from my server are deleted by postfix "smtp_header"checks"): ...
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375 views

What is error code 68 for msmtp and which problems may provoke it?

Sometimes, when I send mails (from alot MUA making use of msmtp) I get the following error message: failed to send: msmtp --account=FOO -t failed with code 68: A process has ended with a probable ...
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416 views

Hotmail not receiving emails from a script, but works from the server

I have a working mail server running Debian stable, the following elements are working. SPF DKIM rDNS My IP is not listed in any backlist, I used: mxtoolbox.com for all this. My problem: Sending ...
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2answers
3k 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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238 views

ssh log sent to email in Cygwin

I am using Cygwin in Windows 7. I am trying to make my syslog-ng daemon send a ssh log via email to me when ever someone tries to log into my computer. I tried using the code below (entered into /etc/...
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227 views

How to disable SMTP auth plain for Citadel 8.20 on Slackware 14.0?

How do I turn off SMTP AUTH PLAIN for Citadel 8.20 on Slackware 14.0? If I set up postfix to handle SMTP would this allow me to not have SMTP auth plain enabled
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relaying mails without authentication

I had to configure OTRS on a RHEL 7 system and one of the tasks was to configure the system to send outgoing mails from the ticketing system. I did so by adding the relayhost directive with the ...
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Milter for Sendmail not sending data over socket - very little documentation, any ideas?

I have configured Milter for sendmail on a virtual machine. I can send an email in my test environment, it is currently accepted by Sendmail and relayed to my exchange server (including when I enable ...
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How to install Postfix in an all default way (no setup wizard) and to be used with no email DNS records?

The following question is a follow up to this question. In a latest Debian 9 stable I desire to install Postfix to send email from my machine to my very own Gmail account by the quickest install ...
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1answer
274 views

SendGrid SMTP integration with Snipe-IT asset management

I am trying to implement SendGrid SMTP integration with snipe-it . I am testing out both applications on a vmware player with centos7 . i have successfully setup snipe-it and now trying to test ...
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1answer
2k views

SMTP relay check (test) (Postfix)

I want to add item/trigger to Zabbix to check that some server A can send mails via mail server B (SMTP relay) without sending on real/fake email and I haven't a problem with firewall/iptables rules ...
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1answer
1k views

Mutt | SMTP session failed: 553 5.7.1

I'm trying to set-up my aol mail to work with mutt. I can read my messeges but can't send/reply. All I get is this message: SMTP session failed: 553 5.7.1 : Sender address rejected: not owned by ...
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1answer
329 views

Postfix - send all notify_classes except failed authentication

How do I configure Postfix/Dovecot to not send errors to the postmaster regarding failed authentication? A botnet continually hammers my server, and I end up with hundreds of these emails: Transcript ...
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215 views

Whitelist certain IP in Debian postfix/courier mailserver

On a debian jessie mailserver with postfix and courier I want to whitelist certain IPs, that are blocked somehow (those IPs are from an openvpn provider) so I can send out mails with that server. I ...
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1k views

Cannot send email via postfix / dovecot error status=deferred (mail transport unavailable)

I am trying to setup a mail server with postfix/dovecot/maria DB on centos 7 and have seem to hit a roadblock. I am not able to send emails to internal users and the logs suggest "mail transport ...