Failed delivery email from twitter

[WorkinOnIt]

Hello

I am seeing hundreds of email from example;

n0420596[email protected]bounce.twitter.com

In the mail delivery queue. The Sender and the Recipient fields are both e.g. me @ mydomain.com

The result field displays this;

SMTP error from remote mail server after end of data: 421-4.7.0 [555.555.555.555] Our system has detected an unusual rate of\n421-4.7.0 unsolicited mail originating from your IP address. To protect our\n421-4.7.0 users from spam, mail sent from your IP address has been temporarily\n421-4.7.0 rate limited. Please visit\n421-4.7.0 Bulk Senders Guidelines - Gmail Help to\n421 4.7.0 review our Bulk Email Senders Guidelines.

It would appear these emails are legitimate as the sender IP is 199.16.156.153 (Twitter inc), but What would be the recommended way to deal with this "flood of emails"?

I have greylisting turned on, but there's no entry in there for the above.

Thanks

 

[Infopro]

Sounds like you're forwarding email from your account to gmail.

 

[WorkinOnIt]

Yes that is correct. Do you care to elaborate further thoughts?

Why would there be so many of these - all with the yellow exclamation status.

 

[Infopro]

Forwarding all account email to gmail is a bad idea. Forwarded email is not scanned, its just forwarded on. Change your email on twitter to use the gmail account.

 

[WorkinOnIt]

This is a customer's account on the server. There are many emails from bounce.twitter - they are using their company email address, so I have no control over it.

Also - it does not appear they are forwarding emails to gmail - I think they are using gmail to "fetch emails from another account you own" - Gmail's POP service.

Any suggestions?

 

[Infopro]

First thing I would do is check the account's Default Address.
cPanel > Email section > Default Address.
If all unrouted mail is being sent to gmail, I would suggest it be removed.

I think they are using gmail to...

It's important to know exactly what they're doing. Discussing it with them might be best.

This post is a bit dated but might be of some use to you/your client:
inmotionhosting.com/support/email/email-client-setup/setting-up-gmail-for-pop3-and-smtp

There's quite a few threads on the forum here related to using gmail you might like to look at as well.

 

[WorkinOnIt]

Thanks for your advice.

It would appear the customer is forwarding mails to gmail from their main business email. However, the default email is doing nothing - in other words, it's empty and there's no forwarding from that.

I understand it's not best practice to forward to gmail, however it only appears to be the bounce.twitter.com emails that are filling up the logs ( at a considerable rate - it seems bounce.twitter is sending them a lot of emails! Most of these appear to be status updates about other users.)

They are using Gmail's POP, along with the forwarding. I gather the forwarding is to assist with the speed of delivery to gmail, since gmail can take up to 20 minutes to retrieve POPed emails (as there is no way to control when Gmail will pop to the account).

 

[Infopro]

You might have your customer send an email, using the email account on your server, to this form:
mail-tester.com
This is useful to check the email account for issues. Those issues could be affecting email sent to gmail.

 

[WorkinOnIt]

Thanks, can't hurt to try

It doesn't really explain why there are so many emails from bounce.twitter.com

 

[Infopro]

Well:

Our system has detected an unusual rate of\n421-4.7.0 unsolicited mail originating from your IP address.

This thread may be of some use:
Google Groups

One of the last replies:

I was speaking to someone with more GMail configuration experience and they mentioned that Google tends to keep throttling an IP for about two weeks after the initial issue is fixed. I have been watching my mail and the issue has gone away. I have to guess, but the resolution coincides exactly two weeks after having configured valid SPF, DKIM, and DMARC records.

Making sure that the domain is setup properly is important.