free.fr about to block mails from osgeo due to excess errors

[strk]

​https://postmaster.free.fr/index_en.html said:

IP 140.211.15.3 is blacklisted for 79668s (too many errors (unexisting recipients, broken connections), testing)

In the email, the error code is 421 :

421 Too many errors from your IP Reason

Your IP address is not blocked, but we do not accept anymore emails from you temporarily due to too much errors generated by your server. If your server continue to generate a big amount of errors, you will be blacklisted for a while and get the "550 Too many errors from your IP" error. Solution

If you host your own SMTP server : while waiting this delay, we recommend

you to verify your configuration (maybe you are an open relay ?). If you are using the “Sender Verify” method which make a connection to our servers to verify the validity of an email, we recommend you to disable it. Your server may also send automatic notices (undeliverable mails, autoreplies; etc.) when receiving spams. In this case, you should try to refuse a mail delivery the soonest possible (while receiving it) to avoid to have to deliver a delivery status notification and/or not to send an automatic reply on mails detected as spams.

If you are using a SMTP relay: please contact your service provider.

[lnicola]

Another example, from SourceForge: ​https://sourceforge.net/p/forge/site-support/19539/

[cvvergara]

I am unsettling the milestone as I could not find a solution.

140dot211dot15dot3 is still blacklisted by free.fr

In the link provided, there was never a solution, but after 11 months of waiting if got unlisted and then listed back again.