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I am wondering why there is only 1 email sent to the recipient when the 'TO' field and 'BCC' field was set as the same email address.

Does the mail server filter it out?

closed as off-topic by Patrick, dhag, Ulrich Schwarz, Satō Katsura, Wouter Verhelst Mar 15 '17 at 12:53

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    This depends on the way your MTA is configured. FWIW, judging from the traffic on the various mailer-related lists, the vast majority of people prefer to receive a single copy. – Satō Katsura Mar 15 '17 at 12:27
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    This should likely be on serverfault. It doesn't have anything to do with Unix or Linux. – Patrick Mar 15 '17 at 12:29
  • Note that Gmail. for example, filters out duplicates; so while you may well have sent two copies of the e-mail, only one may be shown at the receiving end. – dhag Mar 15 '17 at 12:33
  • it gets interesting if you would receive multiple copies of a message through several mailing lists, some systems will even remove the duplicates in the receiving end. – ilkkachu Mar 15 '17 at 12:58

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