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Whitelist email server for membership of non-profit

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Whitelist email server for membership of non-profit

We have started receiving a failure to send error for most of our Comcast clients when we send messages to our members: 421 4.1.0 52.1.81.18 Throttled - try again later. 

What is the process for having an address of a server of a service that your clients sign up for whitelisted ?

Expert

Re: Whitelist email server for membership of non-profit

newsletters and mailing lists can be problematic with any email program.  Try calling Comcast security and see if there is an issue with the sender's domain-----------------

 

Comcast Customer Security Assurance-------------------

Normal business hours (6:00 am to 2:00 am EST, 7 days a week)

1 - 888-565-4329



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