ASKER
ASKER
If you use a Yahoo or AOL email address, expect all or most of email from us + any order tracking (FedEx/UPS/USPS) to never arrive.
To receive 100% of your mail from us + most other sites, switch to a better email service.
ASKER
ASKER
ASKER
Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
TRUSTED BY
1) Once you send a message to Yahoo... then...
2) Yahoo sends a delayed message...
3) Only a custom written MTA takes to correct action of... never, ever, ever running the normal SMTP RFC backup resending sequence.
Running any common MTA - Sendmail, Postfix, EXIM, OpenSMTPD, or any relay like SendGrid or Mailgun... all SMTP code is the same.
When a 4XX temp failure returns, SMTP backup resending starts, which is... well... correct per RFC + will get you blacklisted internally inside Verizon (current owner of all Yahoo + AOL addresses)... so is RFC correct + logically incorrect.
4) You'll either write your own custom MTA code to...
a) Never do any form of auto-resending...
b) Never send any new message, till the actual send delay can be derived.
c) Send delay probing/derivation covered next...