More emails being bounced

Hello again. Following up on:
support.toastmastersclubs.org/2011-10-23...omains-being-bounced

It looks like other emails are being bounced with the other alias's (members, prospects, treasurer, etc.). Was only the "officers" alias fixed for this issue?

Some email domains being bounced:
@collins.com
@prattwhitney.com

I appreciate your help!

I don't see nay issues with collins.com, please be specific.
Who is having the issue? What are they doing sending email to the alias or receiving email from?
I don't see anyone with a prattwhitney.com email address.
 

Mohan Padamati has this secondary email address on our site:
mohan.padamati@prattwhitney.com

Our VPE said the address for Alan Alper bounced but maybe it's working now:
alan.alper2@collins.com

And I just received this:

Delivery delayed:Toastmasters: Area 41 Meet & Greet
    ************************************************      THIS IS A WARNING MESSAGE ONLY      ****  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **    ********************************************** The original message was received at Thu, 29 Sep 2022 11:17:25 GMT from m0266029.ppops.net [127.0.0.1]

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Transcript of session follows

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<This email address is being protected from spambots. You need JavaScript enabled to view it.>,<This email address is being protected from spambots. You need JavaScript enabled to view it.>,<This email address is being protected from spambots. You need JavaScript enabled to view it.>... Deferred: Connection timed out with mail.talkituptoastmasters.org.Warning: message still undelivered after 4 hoursWill keep trying until message is 3 days old

Mail went out to Alan yesterday

Mail went out to Mohan