[UA-EAI] UASG014 - Quick Guide to EAI

[John R. Levine]

> I can put that stronger: I've either worked on or read the source of seven 
> programs/libraries that will send EAI mail, and I don't think any of the 
> seven would be able to fall back to an alternative address.

That sort of fallback mostly makes sense in a webmail system where the MTA 
and MSA and address book are sufficiently integrated.

To do it in postfix or exim you'd need to add an MTA-side address book of 
aliases which is rather unlike anything they do now.  I use qmail which 
can easily tell whether addresses A and B deliver to the same place, but 
cannot tell you the other addresses that deliver the same as A, which is 
what you need here.

Regards,
John Levine, johnl at iecc.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly