A little background info: mail servers are very polite to each other. You say "HELO", they say "250 Ok". It's all some very seemly, gentlemanly conduct. Look at this spammy response from AOL:
Apr 9 12:17:24 [servername] postfix/smtp[23067]: B8698966A: to=[redacted], relay=mailin-04.mx.aol.com[64.12.138.57]:25, delay=804, delays=0/803/0.28/0.23, dsn=5.0.0, status=bounced (host mailin-04.mx.aol.com[64.12.138.57] said: 550 We would love to have gotten this email to [redacted]. But, your recipient never logged onto their free AIM Mail account. Please contact them and let them know that they're missing out on all the super features offered by AIM Mail. And by the way, they're also missing out on your email. Thanks. (in reply to RCPT TO command))
OMFG, AOL. A simple "550 Bounced" would have sufficed. I don't need to feel like the computers want me to be a telemarketer, not to mention that you're swamping our mail logs with this crap.
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