Accounts using Redtail / Zimbra have synchronization or sending issues

Problem Symptoms

Nylas accounts connected to email servers hosted by Redtail / Zimbra ( have difficulties sending, synchronizing, or staying connected. Get 504 errors when sending.


Redtail / Zimbra throttle connections from Nylas as they are unable to support our connection throughput.


If it's a failed send, backoff and retry.

For synchronization, there is no solution. You will see slower synchronization speeds and it will take longer for items to show up in Nylas.


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