Hi there,
I've got a strange issue with my production Qmail server: email clients
say that the certificate is expired, but if I check on Qmail server I
get this result:
[root@mail ~]# certbot certificates|grep days
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Expiry Date: 2025-07-14 19:07:08+00:00 (VALID: 24 days)
Expiry Date: 2025-09-12 21:57:08+00:00 (VALID: 84 days)
Expiry Date: 2025-07-14 18:56:29+00:00 (VALID: 24 days)
Expiry Date: 2025-07-14 18:57:18+00:00 (VALID: 24 days)
Expiry Date: 2025-07-14 18:57:28+00:00 (VALID: 24 days)
Expiry Date: 2025-07-14 18:57:36+00:00 (VALID: 24 days)
Expiry Date: 2025-09-12 21:57:56+00:00 (VALID: 84 days)
Expiry Date: 2025-08-16 14:45:25+00:00 (VALID: 57 days)
Expiry Date: 2025-07-14 18:58:55+00:00 (VALID: 24 days)
Expiry Date: 2025-07-11 16:57:23+00:00 (VALID: 21 days)
Expiry Date: 2025-07-14 18:59:10+00:00 (VALID: 24 days)
Expiry Date: 2025-08-16 14:45:40+00:00 (VALID: 57 days)
Expiry Date: 2025-08-16 14:45:58+00:00 (VALID: 57 days)
Expiry Date: 2025-07-14 18:59:29+00:00 (VALID: 24 days)
Expiry Date: 2025-08-16 14:46:11+00:00 (VALID: 57 days)
Expiry Date: 2025-08-16 14:46:23+00:00 (VALID: 57 days)
If I check the validity of /var/qmail/control/servercert.pem I got this
result:
Common Name : maindomain.it
Alternative Names : maindomain.it, otherdomain.com,
alternativedomain.it, xyz.com, [...], mail.maindomain.it,
mail.otherdomain.com, mail.alternativedomain.it, mail.xyz.com, [...]
Valid From : Apr 15,2025
Valid To : Jul 14,2025
Issuer : Let's Encrypt
Serial Number : 0x06[...]253
Also if I go to https://mail.maindomain.it I see that the certificate is
valid:
But email clients (Outlook, Thunderbird, etc.) say that there is
something wrong with the certificate:
What can I check to fix this issue?
Thanks a lot!
Cesare
