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PMTA knowledge base›Configuration block§ 3.3.9

<source-group>

Several sources as one
Shared limits for several submission addresses

The block is needed where one submitting party comes from several addresses and has to be limited as a whole. It does not list its members itself: each source names the group with its own source-group line.

Inside there are only two directives, and they are opposite in meaning: max-smtp-in — “no more than,” reserved-smtp-in — “no less than.” Both are about simultaneous inbound connections, and both work under the node’s overall limit total-max-smtp-in.

The engine does not check consistency: you have to check the sum of ceilings and the sum of reserves against the overall limit yourself.

Example configuration
# the group is declared here, and the members name it on their side
<source-group localSources>
    max-smtp-in 10
    reserved-smtp-in 5
</source-group>

<source 192.168.0.30>
    source-group localSources
</source>

<source 192.168.0.40>
    source-group localSources
</source>
yellow — — directive names, blue — blocks. They are highlighted the same way in the text of the card.
Block directives: 2
Limits 2
reserved-smtp-inHow many inbound connections are guaranteed to this groupmax-smtp-inA ceiling on simultaneous inbound connections from a group
Compatibility
PowerMTA 6.0
described in the manual of this version · platform: any
The vendor does not state the first version for every directive — there is no note here. The name also appears in the 5.0 edition of the manual.
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What else to read

3 articles

◇Accept, route, deliverA message’s path inside the node: accept, decide where, deliver — and all the settings live between these three steps.◇Four value types the whole config is written inBoolean, domain pattern, regular expression and time interval — defined once in § 3.2 and then used by all directives.◇Reloading settings versus restarting the serviceThe configuration is read at startup, and after that edits are picked up by the reload command — except for the directives the manual marks as requiring a restart.

In the Hub
Cost of a mistake
reversible: harms only while it is set
Scenarios
Configuration lifecycle