Re: [ietf-smtp] parsing SMTP replies

[Laura Atkins <[e-mail]>]

> On 18 Mar 2021, at 23:27, Jeremy Harris <[e-mail]> 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 possible. 

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

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. 

laura 

> 
> 
>> 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.
> -- 
> Cheers,
>  Jeremy
> 
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