I recently had some messages bounce from gmail.com. I went up to their forums to ask what's up, and on the replies, it was pointed out to my that gsmtpd actually sends a rather verbose explanation message when it bounces messages (eg: if it's spam, invalid return address, blacklisted address, etc).
Here's the thread were this was pointed to me. I'm guessing that sending an email from a non-static IP range is enough to trigger a bounce harmelessly: https://productforums.google.com/forum/#!msg/gmail/SQQAbew5tfE/-ue8aO07sf8J Can somebody confirm if these explanations are being dropped by smtpd, if they're non-standard, or what's going on? Cheers, thanks, -- Hugo Osvaldo Barrera A: Because we read from top to bottom, left to right. Q: Why should I start my reply below the quoted text?
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