Throttled messages

[slicciardola]

Hi all,

just a question/doubt:

all throttled messages by suspectlist are definitively lost?

Or there will be a sort of re-send of those messages?

Thanks

[Libin Varghese]

Hi,

Throttling is similar to a soft bounce, it would be up to the sending server to re-attempt delivering those emails to the ESA.

As the connection gets throttled the ESA does not have control of how the sending server would interpret that, ideally they should retry delivery.

- Libin V

[slicciardola]

So, for instance,

if i set that mail.it maximum connections to, for example, 20, the 21nth mail coming will throttled until? is there any grace period or timeout one? Before they are totally lost?

[Libin Varghese]

The rate limit on the ESA is applied for an hour by default.

Again since the email is not in possession of the ESA, how long the email would reattempt would be up to the sending server.

- Libin V

[slicciardola]

I had 20 connections max for single sending host, so, you mean all "over" messages will be retryed and maybe accepted from ESA within a hour? and then totally rejected?

[Libin Varghese]

Rate limit can be configured for the sending host as well as the sending email address.

If over 20 connections are injected by a host within an hour, the ESA would throttle further connections from that host alone for the remainder of the hour.

ESA would not reject those emails , it would continue to throttle till counter resets, the sending host would decide on retrying or rejecting the email.

- Libin V

[slicciardola]

ok, thanks, can i increase this 1 hour time limit?

[Libin Varghese · Accepted solution]

The timer interval can be configured with the listenerconfig command in the CLI.

listenerconfig -> setup

[..] - press enter for the existing settings until you reach this field:

Enter the rate at which injection control counters are reset.
[1h]>

[slicciardola]

And what if i leave the "rate limit for host" at 25 and set this to a higher value? Maybe 4 or 5 hours?

[Libin Varghese]

Not recommended, however it would allow only 25 connections from the host for 4-5 hours.

Do note that the time change affects all facets of rate limiting for all sender groups and mail flow policies as well as the global listener rate limits so it is always recommended that the rate limit value be altered as per requirement and not the counter timer.

- Libin V

[slicciardola]

Ok,

is there a way to have a report of all messages throttling? or all messages Rejected by Receiving Control?

[Libin Varghese]

From Monitor > Sender Groups, you could match the Sender Group to the Mail Flow Policy THROTTLED.

This will show a count of how many messages were triggered by which Sender Group.

The Monitor > Incoming Mail report for domains displays a field "Stopped by reputation filtering" which includes the number of throttled messages from that sender.

You could also use grep commands on the mail_logs for specific searches.

grep "Rejected By Receiving Control" mail_logs

- Libin V