[Top] [All Lists]

Re: [ietf-smtp] parsing SMTP replies

2021-03-19 03:55:53

On 18 Mar 2021, at 23:27, Jeremy Harris <jgh(_at_)wizmail(_dot_)org> wrote:

On 18/03/2021 23:15, Michael Peddemors wrote:
If you show me MTA's currently advertising limits on how much they accept, 
then it may be something that needs to be addressed.

Apart from people building prototypes to demo this proposal, there are no
such MTAs precisely because there is no standard to do so.

The MTAs aren’t advertising limits, but the companies running the MTAs do set 
limits on senders. There’s just no programatic way to advertise them.

Yahoo: limits connections, also limits the number of emails per connection and 
will just close connections after that limit has been reached. 

Gmail: prefers fewer connections and as much mail shoved through it as 

Microsoft: admits there is a limit to connections, but does not make that 

Modern bulk MTAs have built in controls so these limits can be manually 
configured. They also have AI / ML / automatic processes that will modify 
sending behavior on the fly. These can be per MX, IP, MX cluster, or whatever. 

These things are happening already (and have been for a decade) they’re just 
not standardized. 


Either way, it seems like the wrong time/place to put in standards for a 
need that is not yet apparent.

The need is for a more efficient, in roundtrips, way of communicating limits
than getting individual command responses.

ietf-smtp mailing list

Having an Email Crisis?  We can help! 800 823-9674 

Laura Atkins
Word to the Wise
(650) 437-0741          

Email Delivery Blog:     

ietf-smtp mailing list