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  • I need help with a "(may be forged)" issue.

    From Grant Taylor@21:1/5 to All on Sat Jan 22 15:37:35 2022
    Hi,

    I need some help diagnosing why Sendmail 8.15.2 is saying "(may be
    forged)" in the HELO / EHLO and "Possibly forged hostname" in response
    to RCPT TO.

    Dig et al. are able to resolve the names of the connecting IPv6
    address(es) without any problems. Adding the entries (compacted and /
    or expanded) to the /etc/hosts file doesn't make any difference either.

    The sending system has two different IPv6 addresses, both of which the receiving system is able to resolve to names without a problem. Both
    IPs exhibit the same behavior.

    IPv4 between the two systems works perfectly fine.

    Does anyone have any suggestions beyond the superficial "fix reverse
    DNS" that is so common on the Internet?

    The two possible IPv6 addresses (from the same system) are:

    - 2600:3c00:e000:1e9::8849
    - 2600:3c00::f03c:91ff:fe26:8849



    --
    Grant. . . .
    unix || die

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  • From Claus =?iso-8859-1?Q?A=DFmann?= @21:1/5 to Grant Taylor on Sun Jan 23 01:47:27 2022
    Grant Taylor wrote:

    I need some help diagnosing why Sendmail 8.15.2 is saying "(may be

    that's a bit old...

    Which OS?
    If you use Linux, compile with -DHAS_GETHOSTBYNAME2,
    see the README file.

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  • From Grant Taylor@21:1/5 to All on Sun Jan 23 11:08:08 2022
    On 1/22/22 11:47 PM, Claus Aßmann wrote:
    that's a bit old...

    Indeed.

    Which OS?

    Linux.

    If you use Linux, compile with -DHAS_GETHOSTBYNAME2, see the README
    file.

    It's currently a mostly stock install from the VPS provider. So
    re-compiling is going to be a non-trivial change.

    I'll check the README file to see if I can get more background on why HAS_GETHOSTBYNAME2 is a thing and how it's different.

    Thank you Claus.



    --
    Grant. . . .
    unix || die

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