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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I'm trying to diagnose a problem with certain email addresses possibly being blocked on my server. I'm running PHP 5.3 on CentOS 5.7. The php.ini file lists a sendmail_path of /usr/sbin/sendmail -t -i, which when run in CLI hangs there. I've noticed that qmail is installed on my server, too, but I don't know if PHP is using it or not.
/usr/sbin/sendmail -t -i
How do I find out which MTAs (i.e. sendmail, qmail, etc) PHP is using?
TL;DR: PHP doesn't care about what MTA you're using.
Longer explanation: this goes way back almost as far as the POSIX standards themselves, but everyproperly written MTA will provide a binary named sendmail that will behave exactly as the "official" sendmail program would be expected to behave.
sendmail
As a result, every unix program or daemon that, for one reason or other, finds itself needing to email someone, knows they can just call /usr/sbin/sendmail with known options, and be confident that whatever MTA was installed will know what to do with the message from there on in.
/usr/sbin/sendmail
As such, unless you use a specific SMTP PHP module and explicitly to use different mail settings (generally, a remote server/port with or without TLS and/or authentication), it will just call /usr/sbin/sendmail and let the underlying distribution worry about what happens next.
If your mail isn't arriving, I recommend you check the error logs of the MTA (usually in /var/log/mail.* but depends on your distribution and MTA) for answers.
/var/log/mail.*
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