web
You’re offline. This is a read only version of the page.
close
Login
Checkmark

Thank you for your feedback

Your feedback is important!

×

Please let us know how this article can be improved.

Choose all that apply.*


Report a bad link

Out of date (instructions or screenshots)

Missing detail

Other

Mail error "421 socket error connection dropped" sending to Business Mail

How to handle the mail error "421 socket error connection dropped" from third-party senders.

Article ID: SLN29752

Some third-party senders may report receiving a bounceback error of: 

421 4.4.2 Connection dropped due to SocketError

when sending mail to Turbify Business Mail users. This error is due to increased anti-spam measures by Yahoo Mail, our Turbify Business Mail provider.

To prevent this error, the sender needs to have either an SPF record or DKIM configured on their domain for their mail servers. For senders using the Microsoft 365 mail service for their domain (A.K.A. Outlook online), please suggest that they follow the instructions on this Microsoft help page. For other senders, please advise them to speak to their mail administrators.

Note: If you are receiving a "421 socket error" bounceback from the email you send as a Turbify Business Mail user, please contact our support for assistance.

Quick Links

Recommended Articles

Trending Articles