The docs for this (in addition to the 2021 task which will likely help a bit) are here: https://wikitech.wikimedia.org/wiki/SecurePoll#Email_spam

Hi,

Quick update
The voting period has been changed, so are the days the mass email will be sent.
The first one will be sent on Aug 18th and the second one on Aug 26th

The task description has been updated accordingly.
Many thanks

I have now set up the mailing lists (43520 voter email addresses) following the documentation on Wikitech. I tested it using that same documentation and it seems to work as expected. So we should be good to go at least for the first batch of emails on August 18.

The second batch of emails might be a little more of a challenge since they will only be sent to those who have not yet voted. We'll dig into that in the next few days.

Great. That is a good news!
Many thanks @jrbs