smtp.att.yahoo.com
Saturday, September 13th, 2008Connect to smtp.att.yahoo.com and see what is going on.
Create plaintext password
perl -MMIME::Base64 -e 'print encode_base64("\000usename\@sbcglobal.net\000mypassword")'
You will get password like this:
sssssddsdsdsdsds=
Install openssl and connect to smtp.att.yahoo.com
openssl s_client -crlf -connect smtp.att.yahoo.com:465
You should see:
CONNECTED(00000003)
depth=0 /C=US/ST=California/L=Santa Clara/O=Yahoo! Inc./OU=Yahoo/CN=smtp.att.yahoo.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 /C=US/ST=California/L=Santa Clara/O=Yahoo! Inc./OU=Yahoo/CN=smtp.att.yahoo.com
verify error:num=27:certificate not trusted
verify return:1
depth=0 /C=US/ST=California/L=Santa Clara/O=Yahoo! Inc./OU=Yahoo/CN=smtp.att.yahoo.com
verify error:num=21:unable to verify the first certificate
verify return:1
—
Certificate chain
0 s:/C=US/ST=California/L=Santa Clara/O=Yahoo! Inc./OU=Yahoo/CN=smtp.att.yahoo.com
i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
subject=/C=US/ST=California/L=Santa Clara/O=Yahoo! Inc./OU=Yahoo/CN=smtp.att.yahoo.com
issuer=/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
—
No client certificate CA names sent
—
SSL handshake has read 886 bytes and written 316 bytes
—
New, TLSv1/SSLv3, Cipher is AES256-SHA
Server public key is 1024 bit
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1
Cipher : AES256-SHA
Session-ID:
Session-ID-ctx:
Master-Key: Key-Arg : None
Start Time: 1221335335
Timeout : 300 (sec)
Verify return code: 21 (unable to verify the first certificate)
—
220 smtp112.sbc.mail.re2.yahoo.com ESMTP
now enter:
auth plain sssssddsdsdsdsds=
You will see:
235 ok, go ahead (#2.0.0)
Now do:
mail from:
And you will get:
553 From: address not verified; see http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html
closed
—
As you can see all emails going through att need to be verified. You have to add them to a list of email addresses. If you are running a mailing list the only option is to unfilter you port 25.
See
http://wiki.debian.org/Postfix#head-38a3b3d856d4f062f31d9e368ff97b6f7c2185b2
on how to connect to smtp.att.yahoo.com