Sending and Receiving Email both are not working

I don’t know but suddenly receiving and sending email stopped somehow.

Everything was fine two days ago.

By the time i check if my port 25 is opened or not. I mailed my network provider any they said everything is okay from their end. Than i tried with telnet command if my port listening or not. I found It was responding “Connection Refused”.

By the time, my postfix was not restarting properly when i was trying to restart.
Being confused, i have reinstalled postfix which solved restart issue but main problem remains same.

Than i have edited a line in /etc/postfix/main.cf file “inet_interfaces = localhost” to “inet_interfaces = all”.
After this, port started to listen again but my main problem remains same.

I can’t send mail neither i can receive any.
The thing is, if i send any mail mail from my WHMCS panel, it successfully going. But from Rainloop it is saying “Can’t connect to the server”.

Another interesting part is, When anyone send me any mail, it is bouncing from their end but i got a notification in my ssh saying “You have new mail in /var/spool/mail/root”.

Does anyone have any solutions for this?
It is making me mad from last two days. :’(

Thank you.

Here is my last mail log:

Dec 20 16:33:36 limda postfix/smtpd[35601]: connect from 66-220-155-155.mail-mail.facebook.com[66.220.155.155]
Dec 20 16:33:37 limda postfix/smtpd[35601]: NOQUEUE: reject: RCPT from 66-220-155-155.mail-mail.facebook.com[66.220.155.155]: 550 5.1.1 junaid@limda.net: Recipient address rejected: User unknown in local recipient table; from=notification@facebookmail.com to=junaid@limda.net proto=ESMTP helo=<66-220-155-155.mail-mail.facebook.com>
Dec 20 16:33:43 limda postfix/smtpd[35601]: disconnect from 66-220-155-155.mail-mail.facebook.com[66.220.155.155]
Dec 20 16:35:08 limda postfix/pickup[34868]: CF12A9C503: uid=0 from=
Dec 20 16:35:08 limda postfix/cleanup[35649]: CF12A9C503: message-id=20191220163508.CF12A9C503@limda.net
Dec 20 16:35:08 limda postfix/qmgr[34869]: CF12A9C503: from=root@limda.net, size=18529, nrcpt=1 (queue active)
Dec 20 16:35:08 limda postfix/local[35650]: CF12A9C503: to=root@limda.net, orig_to=, relay=local, delay=0.08, delays=0.06/0.02/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
Dec 20 16:35:08 limda postfix/qmgr[34869]: CF12A9C503: removed
Dec 20 16:35:13 limda postfix/pickup[34868]: 50FBA9C503: uid=5005 from=support@limda.net
Dec 20 16:35:13 limda postfix/cleanup[35649]: 50FBA9C503: message-id=lawcoc0cuaNQFLbGQT4U6OvhKcoQAVOXkkre6rzhxv4@www.limda.net
Dec 20 16:35:13 limda postfix/qmgr[34869]: 50FBA9C503: from=support@limda.net, size=47775, nrcpt=1 (queue active)
Dec 20 16:35:15 limda postfix/smtp[35655]: 50FBA9C503: to=cyberapon@gmail.com, relay=gmail-smtp-in.l.google.com[172.217.194.26]:25, delay=1.9, delays=0.02/0.03/0.41/1.5, dsn=2.0.0, status=sent (250 2.0.0 OK 1576859715 b14si9766281pgw.281 - gsmtp)
Dec 20 16:35:15 limda postfix/qmgr[34869]: 50FBA9C503: removed
Dec 20 16:37:03 limda postfix/anvil[35603]: statistics: max connection rate 1/60s for (smtp:54.240.10.236) at Dec 20 16:32:42
Dec 20 16:37:03 limda postfix/anvil[35603]: statistics: max connection count 1 for (smtp:54.240.10.236) at Dec 20 16:32:42
Dec 20 16:37:03 limda postfix/anvil[35603]: statistics: max cache size 2 at Dec 20 16:33:36
Dec 20 16:37:49 limda postfix/smtpd[35673]: connect from 66-220-155-151.mail-mail.facebook.com[66.220.155.151]
Dec 20 16:37:49 limda postfix/smtpd[35673]: NOQUEUE: reject: RCPT from 66-220-155-151.mail-mail.facebook.com[66.220.155.151]: 550 5.1.1 junaid@limda.net: Recipient address rejected: User unknown in local recipient table; from=notification@facebookmail.com to=junaid@limda.net proto=ESMTP helo=<66-220-155-151.mail-mail.facebook.com>
Dec 20 16:37:55 limda postfix/smtpd[35673]: disconnect from 66-220-155-151.mail-mail.facebook.com[66.220.155.151]
Dec 20 16:37:59 limda postfix/smtpd[35673]: connect from 69-171-232-137.mail-mail.facebook.com[69.171.232.137]
Dec 20 16:37:59 limda postfix/smtpd[35673]: NOQUEUE: reject: RCPT from 69-171-232-137.mail-mail.facebook.com[69.171.232.137]: 550 5.1.1 junaid@limda.net: Recipient address rejected: User unknown in local recipient table; from=notification@facebookmail.com to=junaid@limda.net proto=ESMTP helo=<69-171-232-137.mail-mail.facebook.com>
Dec 20 16:38:05 limda postfix/smtpd[35673]: disconnect from 69-171-232-137.mail-mail.facebook.com[69.171.232.137]
Dec 20 16:38:54 limda postfix/smtpd[35673]: connect from mail-lf1-f66.google.com[209.85.167.66]
Dec 20 16:38:55 limda postfix/smtpd[35673]: 0F4049C503: client=mail-lf1-f66.google.com[209.85.167.66]
Dec 20 16:38:55 limda postfix/cleanup[35681]: 0F4049C503: message-id=CAEg8eNR5UgX2p5pzKM6aCoyD3-FE9pasWFrZqkzZ3ct__b96bw@mail.gmail.com
Dec 20 16:38:55 limda postfix/qmgr[34869]: 0F4049C503: from=cyberapon@gmail.com, size=8681, nrcpt=1 (queue active)
Dec 20 16:38:55 limda spamd[14827]: spamd: connection from localhost [::1]:54528 to port 783, fd 6
Dec 20 16:38:55 limda spamd[14827]: spamd: setuid to spamd succeeded
Dec 20 16:38:55 limda spamd[14827]: spamd: processing message CAEg8eNR5UgX2p5pzKM6aCoyD3-FE9pasWFrZqkzZ3ct__b96bw@mail.gmail.com for spamd:5007
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: Use of uninitialized value $rr_type in string eq at /usr/share/perl5/vendor_perl/Mail/SpamAssassin/Plugin/AskDNS.pm line 592, line 165.
Dec 20 16:38:55 limda spamd[14827]: spamd: clean message (0.7/5.0) for spamd:5007 in 0.2 seconds, 8556 bytes.
Dec 20 16:38:55 limda spamd[14827]: spamd: result: . 0 - DATE_IN_PAST_12_24,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,HTML_MESSAGE,SPF_HELO_NONE,SPF_NONE,T_REMOTE_IMAGE scantime=0.2,size=8556,user=spamd,uid=5007,required_score=5.0,rhost=localhost,raddr=::1,rport=54528,mid=CAEg8eNR5UgX2p5pzKM6aCoyD3-FE9pasWFrZqkzZ3ct__b96bw@mail.gmail.com,autolearn=no autolearn_force=no
Dec 20 16:38:55 limda postfix/smtpd[35673]: disconnect from mail-lf1-f66.google.com[209.85.167.66]
Dec 20 16:38:55 limda postfix/pipe[35682]: 0F4049C503: to=support@limda.net, relay=spamassassin, delay=0.7, delays=0.34/0.02/0/0.34, dsn=2.0.0, status=sent (delivered via spamassassin service)
Dec 20 16:38:55 limda postfix/qmgr[34869]: 0F4049C503: removed
Dec 20 16:38:55 limda postfix/pickup[34868]: B6A6C9C504: uid=5007 from=cyberapon@gmail.com
Dec 20 16:38:55 limda postfix/cleanup[35681]: B6A6C9C504: message-id=CAEg8eNR5UgX2p5pzKM6aCoyD3-FE9pasWFrZqkzZ3ct__b96bw@mail.gmail.com
Dec 20 16:38:55 limda spamd[14826]: prefork: child states: II
Dec 20 16:38:55 limda postfix/qmgr[34869]: B6A6C9C504: from=cyberapon@gmail.com, size=9096, nrcpt=1 (queue active)
Dec 20 16:38:55 limda postfix/local[35686]: B6A6C9C504: to=root@limda.net, orig_to=support@limda.net, relay=local, delay=0.09, delays=0.07/0.02/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
Dec 20 16:38:55 limda postfix/qmgr[34869]: B6A6C9C504: removed
Dec 20 16:39:13 limda postfix/smtpd[35673]: connect from 66-220-155-157.mail-mail.facebook.com[66.220.155.157]
Dec 20 16:39:14 limda postfix/smtpd[35673]: NOQUEUE: reject: RCPT from 66-220-155-157.mail-mail.facebook.com[66.220.155.157]: 550 5.1.1 junaid@limda.net: Recipient address rejected: User unknown in local recipient table; from=notification@facebookmail.com to=junaid@limda.net proto=ESMTP helo=<66-220-155-157.mail-mail.facebook.com>
Dec 20 16:39:19 limda postfix/smtpd[35673]: disconnect from 66-220-155-157.mail-mail.facebook.com[66.220.155.157]