Yahoo FBL confirmation problems

yahoo_en-US_f_p_142x37Over the last few months I’ve seen people complaining about losing the Yahoo FBL emails with verification codes. This seems to be intermittent and no one could really explain what was going on.
Dale Lopez, VP of operations for V12 group, shared that their operations group discovered that one issue with the missing verification emails has to do with the length of the From: address and a port25 default settings.
In Dale’s words:

We figured it out and have confirmed via test. . .  If you are a PowerMTA user (Port25 Solutions), the default from line that PMTA accepts is set to 64. The from line that Yahoo has in the verification code message, is much longer. If you increase the length of the maximum characters to 254, you should receive the verification email.

So if you’re having problems receiving the Yahoo verification emails, check with your IT department to make sure you’re not restricting the path length. The “path” in this case is the return-path address. RFC 5321 says “the maximum total length of a reverse-path or forward-path is 256 octets (including the punctuation and element separators).” Reverse-Path in this case is the address in the envelope from, Forward-Path is the address in the To: line.
So if you’re one of the companies having problems receiving the Y! verification email, check you incoming mail settings and make sure you’re not blocking long email addresses.
 

Related Posts

Yahoo Mail Deliverability FAQ Updated

Yahoo has updated their FAQ and listed out a number of factors they use to determine if a mail message is spam.

Read More

Yahoo update

It has been quite a while since I have had the opportunity to share information about Yahoo here on the blog, but there is new information to share.
Yesterday, Mark Risher from Yahoo spent some time talking with people about all things spam over at Yahoo. Matt from EmailKarma posted the transcripts as well as some excerpts from the talk. The really interesting bit, for me, was confirmation that Yahoo will be bringing back their FBL in the next few weeks. I have been hearing rumors about the return of the FBL for a while now, and it seems the general timeline (fall-ish) is accurate.
Speaking of the feedback loop, there have also been rumors that Yahoo is not accepting any changes to existing feedback loops. This does not seem to be the case. According to an internal person, companies who are currently in the beta FBL program can make changes to the program by contacting the postmaster team.

Read More

Problems with Yahoo FBL

There are a couple problems I’ve been alerted to with the Yahoo FBL today.
The first comes from Michael Ellis and is about broken FBL reporting at Yahoo.

Read More