Thu Jan 21 09:20:40 CET 2010

Mail server blocked??

2010-01-19 21:12:16 H=n76.bullet.mail.sp1.yahoo.com [] sender verify fail for <...@sbcglobal.net>: response to "MAIL FROM:<>" from sbcmx8.prodigy.net [] was: 553 5.3.0 nlpi141 - o0JKCGjj027576, DNSBL:ATTRBL 521< >_is_blocked.__For_information_see_http://att.net/blocks
2010-01-19 21:12:16 H=n76.bullet.mail.sp1.yahoo.com [] F=<...@sbcglobal.net> rejected RCPT <mdh@deyofthephoenix.com>: Sender verify failed

I tried with [2] and there is no mention of on a blacklist.
Neither at spamhous[3].  AT&T info page[3] also mentions symantec[5],
but not listed there either.

As suggested in AT&T info page [3] I'm submitting a report at [6].

It is suggested to add an SPF[8] record in the DNS. For tinydns[7]:


However, does this mean it's no longer allowed to send this email
using a different SMTP?  Maybe not such a good idea.

[1] http://forums.whirlpool.net.au/forum-replies-archive.cfm/1147314.html
[2] http://www.mxtoolbox.com/blacklists.aspx
[3] http://worldnet.att.net/general-info/521.html
[4] http://www.spamhaus.org/
[5] http://ipremoval.sms.symantec.com/lookup/
[6] http://worldnet.att.net/general-info/block_admin.html
[7] http://www.anders.com/projects/sysadmin/djbdnsRecordBuilder/
[8] http://en.wikipedia.org/wiki/Sender_Policy_Framework