When I use IBMs sendmail on an IBM RS/6000 running AIX trying to get to certain sites, it seems that I can get to some of them and not others. Whats wrong?
There are two possible problems here: 1) Your version of sendmail is not configured to recognize MX records in the DNS. Search through your sendmail.cf looking for “OK MX” or “OK ALL”. Older configurations had this line commented out, and this will cause mail from you to some sites to fail (because those sites have MX records, but no A records in their DNS for the specific Fully Qualified Domain Name you’re trying to mail to). For more information, see the comp.unix.aix FAQ ftp://rtfm.mit.edu/pub/usenet/news.answers/aix-faq/. 2) There is a negative caching bug in AIX 3.2.5 with /usr/sbin/named executables that are less than 103000 bytes long. Ask your IBM representative to give you PMP 3251, or the most recent patch that fixes this problem for your particular configuration and version of the OS.
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