https://www.wormly.com/test_smtp_server
Janet, you haven't done the right test. The address OP is having problems with is saif@altawi.com.sa.
Because OP has set up two MX records, we need to check both mail exchangers.
78.93.244.61, the priority 0 MX, claims to have delivered the message successfully:
Connecting...
SMTP -> FROM SERVER:
220 mserver.altawi.com.sa ESMTP
SMTP -> FROM SERVER:
250-altawi.com.sa Hi node-mec2.wormly.com [184.72.226.23]
250-PIPELINING
250-8BITMIME
250-SIZE 15000000
250 STARTTLS
MAIL FROM: saif@altawi.com.sa
SMTP -> FROM SERVER:
250 , sender OK - how exciting to get mail from you!
RCPT TO: saif@altawi.com.sa
SMTP -> FROM SERVER:
250 , recipient ok
Sending Mail Message Body...
SMTP -> FROM SERVER:
354 go ahead
SMTP -> FROM SERVER:
250 Queued! 1389674560 qp 18322 <>
Message completed successfully.
212.93.222.10, the priority 1 MX, also accepts the message:
Connecting...
SMTP -> FROM SERVER:
220-webx1.awalnet.com ESMTP Exim 4.80.1 #2 Tue, 14 Jan 2014 07:43:55 +0300
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
SMTP -> FROM SERVER:
250-webx1.awalnet.com Hello node-mec2.wormly.com [184.72.226.23]
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
MAIL FROM: saif@altawi.com.sa
SMTP -> FROM SERVER:
250 OK
RCPT TO: saif@altawi.com.sa
SMTP -> FROM SERVER:
250 Accepted
Sending Mail Message Body...
SMTP -> FROM SERVER:
354 Enter message, ending with "." on a line by itself
SMTP -> FROM SERVER:
250 OK id=1W2vr2-0006uY-0Q
Message completed successfully.
But 212.93.222.10 also accepts badaddress@altawi.com.sa, which you don't want it to do. When I tried to test
78.93.244.61, I found that it was not online.
But that was only temporary - a few moments later it behaved as it should:
...
550 relaying denied badaddress@altawi.com.sa
SMTP -> ERROR: RCPT not accepted from server: 550 relaying denied badaddress@altawi.com.sa
...
OP should remove the MX record for 212.93.222.10.
I have seen no explanation for the mentions of c-panel. c-panel is not part of SME server, and shouldn't have anything to do with this issue. Why are you mentioning it?
Connecting...
SMTP -> ERROR: Failed to connect to server: Connection timed out (110)
Message sending failed.