The following logs may be present in the /var/log/mailllog file:ĬONFIG_TEXT: localhost postfix/smtpd: NOQUEUE: reject: RCPT from rver: 554 5.7.1 Service unavailable Client host blocked using zen.dnsbl proto=ESMTP helo= Switch off STARTTLS for that server or contact your service provider. The following message appears in the mail client:ĬONFIG_TEXT: An error occurred sending mail: Unable to establish a secure link with SMTP server using STARTTLS since it doesn't advertise that feature.

Incoming emails to Plesk server (with configured local mail service) from specific senders are rejected, blocked or received into junk folder. Incoming emails are not delivered on Plesk server: /usr/bin/deliverquota: No such file or directory.Unable to send email to Gmail: This message does not pass authentication checks (SPF and DKIM both 550-5.7.26 do not pass).

Unable to create a new mailbox on a server with SmarterMail: Incorrect Content-Type: must be textual to extract_string, JSON to extract_json.Unable to connect to Mailbox via Roundcube webmail or any email client via IMAP if Plesk Premium Email is installed: Connection failed.How to make custom changes in Roundcube/Horde configuration files persistent?.Is it possible to set a custom DKIM selector on Plesk for Linux server?.

Email header analysis reports SPF failed for localhost IP on mail sent from Plesk hosted mailbox: SPF Authentication : SPF Failed for IP - 127.0.0.1.Mailbox Size Limit in SmarterMail is not updated when changing mailbox size in Plesk.How to change DKIM key value in Plesk without causing mail delivery outages.How to identify spam source on Plesk for Linux Server.

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