I got the attached report about a double bounce from my incoming postfix
server "Postfix SMTP server: errors from
nullbounce.com[116.202.14.127]:57394" . When I realize that this error
is totally bogus, I want to blackhole that whole netblock. I see a
double bounce, my heart jumps, I'm thinking "have I messed up my
config?" . I do NOT want bogus error-notifications. Then I realize that
this is an "email verification service", I get second thoughts. I'm a
tiny host, just closest family. Will recipients stop welcoming mail from
us, if we just drop packets from 116.202.0.0/15, where nullbounce.com
lives ? I really feel the need to stran^H^H^H^H^H never see them again.
To the best of my ability I've set up all the acronyms (spf, DKIM, ARC
...) , so gmail and outlook are seemingly happy to get mail from me via
my providers mail-gateway. Do I need to allow nullbounce.com's
shenanigans to be able to continue running my server?
--- Begin Message ---
Transcript of session follows.
Out: 220 incoming.alstadheim.priv.no ESMTP Postfix (Debian/GNU)
In: EHLO nullbounce.com
Out: 250-incoming.alstadheim.priv.no
Out: 250-PIPELINING
Out: 250-SIZE 512000000
Out: 250-VRFY
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250-SMTPUTF8
Out: 250 CHUNKING
In: RSET
Out: 250 2.0.0 Ok
In: MAIL FROM:<[email protected]>
Out: 250 2.1.0 Ok
In: RCPT TO:<[email protected]>
Out: 550 5.1.1 <[email protected]>: Recipient address
rejected: User unknown in local recipient table
In: QUIT
Out: 221 2.0.0 Bye
For other details, see the local mail logfile
--- End Message ---
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