Sendmail Error Logs and Solutions

1. When running the sendmail service: *** ERROR: FEATURE() should be before MAILER()

*** ERROR: FEATURE() should be before MAILER() *** MAILER(local') must appear after FEATURE(always_add_domain')*** ERROR: FEATURE() should be before MAILER() *** MAILER(local') must appear after FEATURE(allmasquerade')*** ERROR: FEATURE() should be before MAILER()

Modify the last few lines of sendmail.mc.

vi /etc/mail/sendmail.mc

In the document, the

MAILER_DEFINITIONS
MAILER(`local')dnl
MAILER(`smtp')dnl

Add to the end of the document.

2. When sending mail, the error "Cannot write ./dft4D3WxZ2020101 (bfcommit, uid=0, gid=113): Permission denied" appears

Set the user, group, and permissions of the following folders.

drwxrws--- 2 smmta    smmta    4096 May 13 11:33 mqueue
drwxrws--- 2 smmsp    smmsp    4096 May 13 11:37 mqueue-client

3. Email is returned with the error 500 Error: bad syntax

    ----- Transcript of session follows -----
... while talking to mxn.mxhichina.com.:

MAIL From:<user@localhost> BODY=8BITMIME

<<< 500 Error: bad syntax
554 5.0.0 Service unavailable

Modify /etc/mail/sendmail.cf, comment out the following line

# DMlocalhost

Or edit /etc/mail/sendmail.mc, comment out the line below, and run "m4 sendmail.mc > sendmail.cf"

dnl MASQUERADE_AS(`localhost')dnl     # Comments in this file start with "dnl" at the beginning of the line

4. sh: 0: getcwd() failed: No such file or directory

After deleting a certain directory, if the command is still in that directory, this error will appear. Switch to another directory and the error will go away.

5. After changing sendmail and dovecot to the maildir format, the outbox and sent folders are normal, but there are no emails in the inbox. Checking the files in "/var/mail/", I found that sendmail is still in mailbox format.

Refer to the article "Debian Linux 7.0 Sendmail/Dovecot Mail Directory Maildir Settings" and check whether the "/etc/procmailrc" file has been modified.

6. imap-login: Fatal: Can't load private ssl_key: Key is for a different cert than ssl_cert

The cause of this error is usually that the entire "dovecot" configuration file was copied directly into the "/etc/dovecot" directory, overwriting the original certificate in that directory. The solution is to copy the certificate "dovecot.pem" file and the "private" directory from "/usr/share/dovecot" instead.