do not use the external email address of the user as the sender of Let`s Encrypt renewal notifications.
Appearantly Plesk is using the Administrators EXTERNAL email address whenever sending Let's Encrypt renewal notifications to the certificate "owners".
Since its not uncommon that a Plesk server is NOT an authenticated sender for an EXTERNAL email domain these messages tend to end up in the spam folder of the receipient if accepted by their email server (which might be external too) at all.
I'd like my Plesk Installtion to use the admins/users standard email address as the sender address instead, chances are that the server is indeed an authenticated sender for those email adresses.
Plesk uses the email address for certificates that is set in the email address input line on the dialog where you can issue a certificate. The user can freely choose which email address is entered.
-- PD
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Please review these two other feature requests and the KB article. The feature should already be available.
-- PD
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Stefan Pey commented
Plesk sends notifications TO that email address (which is also an external email, but that doesnt matter in this case) but from the Administrators EMail - and unfortunately, as I said it uses his external email in my case.