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:<i...@nullbounce.com>
 Out: 250 2.1.0 Ok
 In:  RCPT TO:<bent.jorgen...@alstadheim.priv.no>
 Out: 550 5.1.1 <bent.jorgen...@alstadheim.priv.no>: 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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