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Dyn Email: Charlie On The VMTA

Dyn Dyn Email: Charlie On The VMTA

“Did he ever return? No he never returned and his fate is still unlearn’d. He may ride forever ‘neath the streets of Boston. He’s the man who never returned.”

As a New England native and a folk song lover, I have had Charlie On The M.T.A. (short for the Massachusetts Transit Authority, the subway system in Boston) by the Kingston Trio stuck in my head many a day.

Humming the tune the other day, I couldn’t help but think of all the email messages that clients send that will never make it through our VMTA (Virtual Mail Transport Agent) and how they are all little Charlies of their own.

Here are some ways your message will not reach their final destination, so read carefully to reduce the Charlies on your next deploy.

Citizens, hear me out! This can happen to you!

From Address Is Not An Approved Sender

All From addresses must be approved senders in our system – either set by the web portal or the API. Don’t stop there! Set the SPF and DKIM in your DNS records (preferably with DynECT Managed DNS) at least 24 hours before you intend to deploy for the best deliverability experience.

Suppressed/Previously Hard Bounced

Any message that hard bounces (defined as getting a 500 series message from a mail server or a domain that doesn’t exist) or receives a spam complaint will not be resent through our system while it is still on the suppression list. Addresses can be individually taken off the suppression list if need be.

Improper SMTP

If there is an improper SMTP conversation, the message will not be parsed correctly and therefore not make it to the VMTA. If you are not sure about what constitutes a proper message be sure to read up on SMTP and the RFC specifications.

Locked Out Account

In the event your account has been identified as committing abuse (such as sending spam) or if you are behind on your bill, our group may be asked to lock out your account. If your account is locked, you will be denied SMTP connection. Hopefully, this will never have to happen.

Follow these steps and Charlie will get off the train at the appropriate stop. If you have any questions, contact your friendly Dyn Concierge Team…and don’t forget to keep some nickels in your pocket.


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Whois: Matt Torrisi

Matt Torrisi is a Senior Solutions Engineer at Oracle Dyn Global Business Unit, a pioneer in managed DNS and a leader in cloud-based infrastructure that connects users with digital content and experiences across a global internet.