Re: [exim] Unexplained Long Retry Time

On 22/03/16 14:25, Kevin Smith wrote:
> Route: nellie@???:<<user1>@<thisdomain>> error -44: SMTP error from remote mail server after RCPT TO:<Nellie@???>: host ASPMX.L.GOOGLE.com [173.194.208.26]: 451-4.3.0 Multiple destination

Google infrastructure apparently cannot handle a multi-recipient
message for disparate domains (duh!). Despite being perfectly
normal and standard MTA operation.

I use:

multi_domain = ${if match{$host}{(?i)google.com\$}} {no}{yes}}

on my outbound smtp transport for this reason. It very obviously
won't scale if more 800lb gorillas start behaving so.
--
Cheers,
Jeremy