Hello,

I have a postfix which works quite OK with both IPv4 and IPv6 but just today I see some errors comming from one of the authenticated users.

Out: 220 xxx.yyy.ro ESMTP Postfix
In:  EHLO [zzzz:zzzz:z:z:zzzz:zzzz:fe79:ccd9]
Out: 250-xxx.yyy.ro
Out: 250-PIPELINING
Out: 250-SIZE 51200000
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-AUTH LOGIN
Out: 250-AUTH=LOGIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250 DSN
In:  AUTH LOGIN
Out: 334 ++++++++++
In:  +++++++++++++++++++
Out: 334 ++++++++++++
In:  ++++++++++++++++
Out: 235 2.7.0 Authentication successful
In:  MAIL FROM:<u...@yyy.ro>
Out: 250 2.1.0 Ok
In:  RCPT TO:<u...@domain.com>
Out: 501 5.5.2 <[zzzz:zzzz:z:z:zzzz:zzzz:fe79:ccd9]>: Helo command rejected:
    invalid ip address
In:  QUIT
Out: 221 2.0.0 Bye

Could someone share some thought about it?

mail_version = 2.7.0 (debian package)

--
Arthur Titeica

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