How do I configure my MTA (Postfix, Sendmail) to use the new Yahoo SMTP servers?
The new Yahoo mail servers have a few significant differences over the old Ameritech servers other than the obvious change to smtp.ameritech.yahoo.com. First, the servers require authentication. This authentication consists of the full username (e.g. username@ameritech.net) and password. Most modern MTA’s will authenticate to a relay host (also known as a smart host). The Yahoo servers only accept basic authentication – PLAIN(cleartext) or LOGIN(hashed account info). Secondly, Yahoo sends MTA’s to a “fake” mail server (nomail.yahoo.com) via a false MX record. This may be to prevent the spread of worms and viruses with built-in SMTP servers or may be to prevent folks from running MTA’s. Regardless, to prevent the lookup and use of this false MX record, most MTA’s require [square brackets] around the host or IP address(Microsoft). Although Yahoo’s FAQ says the From: field requires your username@ameritech.net address, this is not true. You can have username@otherdomain.com in the From: fi
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