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Do you know that your messages arrive in all cases? Not merely fail to bounce, but arrive? I help with IT for a small non-profit membership org, and the proble
by syntheticnature 7y ago
Do you know that your messages arrive in all cases? Not merely fail to bounce, but arrive?
I help with IT for a small non-profit membership org, and the problem isn't the places that throw errors when you send, but the ones that silently accept the message without complaint and route it to /dev/null. We get through fine to Google, but the other big providers are random at best about it.
- LIV2 7y agoSome mail systems can tell you if a user is valid or not during the initial connection while some forward to another mail system or delivery process and therefore cannot tell your MX during their conversation that the recipient is invalid. The downstream MX could be configured to then send an NDR email itself but this lands you on spam lists as "backscattering" will then send spam back to whoever owns the email address the spammer is spoofing so it's generally not done.
- rhizome 7y ago>Do you know that your messages arrive in all cases? "I have no trouble sending to anybody (that I've heard of from recipients" might not be as artfully written as I would like, but that's what that refers to. Furthermore, blackholing emails like you suggest is generally rare. RFC 5321 (SMTP) states: "[D]ropping mail without notification of the sender is permitted in practice. However, it is extremely dangerous and violates a long tradition and community expectations that mail is either delivered or returned. If silent message-dropping is misused, it could easily undermine confidence in the reliability of the Internet's mail systems. So silent dropping of messages should be considered only in those cases where there is very high confidence that the messages are seriously fraudulent or otherwise inappropriate."