Yahoo SMTP Error 421 4.7.1 [TS03]

webmasteryoda

Well-Known Member
Apr 3, 2013
96
7
8
Serbia
cPanel Access Level
Root Administrator
I know that this is NOT cPanel issue, but maybe someone knows how to deal with this problem. Or someone else needs help.

10 days ago my users stopped sending mails to Yahoo. All of them receive this error:

Code:
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email protected]
    SMTP error from remote mail server after initial connection:
    host mta7.am0.yahoodns.net [66.196.118.37]: 421 4.7.1 [TS03] All messages from
xx.xx.xx.xx will be permanently deferred; Retrying will NOT succeed. See
http://postmaster.yahoo.com/421-ts03.html:
    retry timeout exceeded
I filled the Yahoo Mail Bulk Sender Form here:
Yahoo! Mail Bulk Sender Form | Yahoo! Postmaster Help
but after 72 hours I still didnt received an answer.

Of course I secured my VPS by enabling some email security options and DKIM / SPF auth. My Reverse DNS is fine too. I dont send any mailing lists or spam. But my IP address is blocked by Yahoo.

Now I dont know what to do.
Do I have to wait or send another form?
Any kind of Yahoo support via email or any other channel?

Anyone here with similar problem?
 

24x7server

Well-Known Member
Apr 17, 2013
1,894
91
78
India
cPanel Access Level
Root Administrator
Hello,

I can see your mail IP is permanently blacklisted in yahoo so I will suggest you currently changed your mail server IP so that your user will not face any issues with the yahoo and try to contact again to yahoo about your blacklisted IP

Please check : Changing the Sending IP for Outbound Email in Exim
 

webmasteryoda

Well-Known Member
Apr 3, 2013
96
7
8
Serbia
cPanel Access Level
Root Administrator
Thank you for your answer.

Yes that was also suggested by my internet provider. At this moment I am waiting for the Yahoo to reply.

If they refuse to remove my IP from their blacklist I ll try this solution to send emails from another (additional) IP.

I ll post any progress here.
 

webmasteryoda

Well-Known Member
Apr 3, 2013
96
7
8
Serbia
cPanel Access Level
Root Administrator
The problem is solved.
Yesterday I submited my form again to Yahoo. And they replied to me to let me know they removed my IP form blocklist.
Mail sending to Yahoo is functioning again.
So, I must say that the key of solving this problem was to be persistent. I wrote to them 3 times. And they finally helped.
 

lorio

Well-Known Member
Feb 25, 2004
298
14
168
cPanel Access Level
Root Administrator
Since you talked about users what did you entered into the form when they ask about privacy policy or how long it takes to remove invalid emails from mailing lists. The answers to these questions differ from user to user. And you don't control how your users/customers care about there customer database.
 

lorio

Well-Known Member
Feb 25, 2004
298
14
168
cPanel Access Level
Root Administrator
"No privacy policy"
Just be patient.
I haven't submitted such an form. I visited a few postmaster sites and their feedbackloop systems.
The yahoo form was deeply hidden (not sure if I found it via a search engine instead of a direct link).

So you didn't answer all questions of that form. Ok, you entered "No privacy policy". Interesting.
If you are not sending bulk mails, you still have to answer this form. Someone told me Yahoo see 50 mails as bulk.
To host a forum in 2013 will be a hard business if all big freemail provider see it that way.

It might be time for a special EXIM WHM AddOn where you can change behaviour email destination wise with individual rules. Only send 1 per hour per person per freemailer ;-)
 

cPanelMichael

Technical Support Community Manager
Staff member
Apr 11, 2011
47,910
2,233
363
cPanel Access Level
DataCenter Provider
Twitter
It might be time for a special EXIM WHM AddOn where you can change behaviour email destination wise with individual rules. Only send 1 per hour per person per freemailer ;-)
You are welcome to submit a feature request for any additional feature that you feel would be useful for cPanel/WHM:

Submit A Feature Request

Thank you.
 

erenada

Registered
Feb 6, 2014
1
0
1
cPanel Access Level
Root Administrator
Hello, Hello Can u pls tell me Where the form which u had submitted to yahoo?
i cant find where is the form

i have same problem i have take a new ip and teh new ip gives 421 4.7.1 [TS03]

thank u!

- - - Updated - - -

The problem is solved.
Yesterday I submited my form again to Yahoo. And they replied to me to let me know they removed my IP form blocklist.
Mail sending to Yahoo is functioning again.
So, I must say that the key of solving this problem was to be persistent. I wrote to them 3 times. And they finally helped.
Hello, Hello Can u pls tell me Where the form which u had submitted to yahoo?
i cant find where is the form

i have same problem i have take a new ip and teh new ip gives 421 4.7.1 [TS03]

thank u!