Good morning Murray,
Thanks for the key info I'm changing our text record today so I'll see
how that works. In the meanwhile, I ran the mailserver all weekend and
saw no signs of the filter crashing. I looked in the maillogs and
messages and other than not signing, nothing shows. If you would like
info from a different source let me know how to get it and I will be
happy to send it to you. Thanks for the help.
Jim Maloney
Murray S. Kucherawy wrote:
The breaking up of a large TXT record in a zone file would look like this:
mail._domainkey IN TXT "foo" "bar baz" "blivit"
...which would be treated by libdkim as "foobar bazblivit" (i.e. the
substrings are simply concatenated). However, libdkim does expect every
TXT reply to be a complete record. To wit, the nameserver is free to
return those TXT records in any order, and libdkim has no idea how to
reassemble them in that case. The words in quotes in that example can't
each exceed 255 characters, but the record as a whole can by having more
than one of those strings in it.
Unfortunately it sounds like AT&T's software provides a pretty serious
limitation. Fortunately smaller keys (e.g. 512 bits) do fit inside a
single TXT character string; you're just limited to those smaller keys
until they either remove the limitation or you delegate your _domainkey
subdomain to a nameserver over which you have more direct access.
Were you able to get any evidence of a crash of the filter?
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