Email reports not received. Error: Insufficient system resources

SUMMARY

Email relay server reports Insufficient system resources

ISSUE

Emails are not being received.

To determine if this is a result of "Insufficient system resources", run the following test.

  1. Login to the Unitrends Backup systems console or use putty to access a command line.
  2. Run a telnet to the mail server using port 25 (or the port being used for email relay).
[[email protected] ~]# telnet 10.10.10.10 25
//where 10.10.10.10 is the IP of the mail server and port 25 is being used for email relay

Example output below (last line is important):
 

Trying 10.10.10.10...
Connected to 10.10.10.10.
Escape character is '^]'.
220 DCExchange.domain.local Microsoft ESMTP MAIL Service ready at Wed, 12 Apr 2017 19:19:59 -0500
EHLO
250-DCExchange.domain.local Hello [10.10.10.11]
250-SIZE 37748736
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-X-ANONYMOUSTLS
250-AUTH NTLM
250-X-EXPS GSSAPI NTLM
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 XRDST
MAIL FROM:[email protected]
250 2.1.0 Sender OK
RCPT TO:[email protected]
550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain
RCPT TO: [email protected]
250 2.1.5 Recipient OK
DATA
354 Start mail input; end with <CRLF>.<CRLF>
THIS IS A TEST EMAIL FROM UNITRENDS
.
452 4.3.1 Insufficient system resources
  1. Search the maillog on the Unitrends Backup system for the key phrase "Insufficient system resources".
 
# grep "Insufficient system resources" /var/log/maillog*
Apr 12 08:38:37 UB sendmail[16715]: v38E04xl029431: to=<[email protected]>, ctladdr=<[email protected]> (0/0), delay=3+23:38:33, xdelay=00:00:00, mailer=relay, pri=8764371, relay=[10.10.10.10] [10.10.10.10], dsn=4.0.0, stat=Deferred: 452 4.3.1 Insufficient system resources

 

RESOLUTION

Check the mail server to determine if it has adequate system resources such as storage space, memory and processing threads.  This may also be caused by an improperly running or rouge service on the mail server.

Alternatively, an alternate mail server should be used to further determine the cause of this error.

CAUSE

The mail relay process "sendmail" receives this output from the mail server.

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