Victor Polevoy asked:
I am using
mailu (docker mail server) as all-in-one mail server solution: pop3/imap/smtp with web-interface and so on. I can send emails from my vds to any other email and I can send email from one mailbox to another one using the same server (like, from
[email protected] to
[email protected]). However, when I send a text from
gmail (or any other mail server outside my vds) my webserver is not contacted at all and I have “recipient not found” message then. This happens from time to time and I don’t know the reason for it.
My domain is
thefx.co and it has all needed records:
$ dig @188.8.131.52 thefx.co mx ; <<>> DiG 9.13.3 <<>> @184.108.40.206 thefx.co mx ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45588 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;thefx.co. IN MX ;; ANSWER SECTION: thefx.co. 1799 IN MX 0 thefx.co. thefx.co. 1799 IN MX 10 mailstore1.secureserver.net. thefx.co. 1799 IN MX 1 smtp.secureserver.net. ;; Query time: 66 msec ;; SERVER: 220.127.116.11#53(18.104.22.168) ;; WHEN: Sat Oct 27 18:34:54 MSK 2018 ;; MSG SIZE rcvd: 117
And the domain is accessible of course. But sometimes (and now also) other mail servers can’t reach mine:
X record found: thefx.co (Priority 0) MX record found: smtp.secureserver.net (Priority 1) MX record found: mailstore1.secureserver.net (Priority 10) Connecting to thefx.co Connect to thefx.co failed Connecting to smtp.secureserver.net Connected to smtp.secureserver.net Dialog with smtp.secureserver.net ok ------------------------------------------------------------ 220 p3plibsmtp01-08.prod.phx3.secureserver.net bizsmtp ESMTP server ready HELO verifyemailaddress.org 250 p3plibsmtp01-08.prod.phx3.secureserver.net hello [22.214.171.124], pleased to meet you MAIL FROM: <[email protected]> 250 2.1.0 <[email protected]> sender ok RCPT TO: <[email protected]> 550 5.1.1 <[email protected]> Recipient not found. <http://x.co/irbounce> QUIT 221 2.0.0 p3plibsmtp01-08.prod.phx3.secureserver.net bizsmtp closing connection ------------------------------------------------------------ Email address [email protected] rejected
I have no idea why anyone can’t connect to my server but If I try to see whether I have opened ports or not, I see they actually are opened:
$ nmap thefx.co Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-27 18:48 MSK Nmap scan report for thefx.co (126.96.36.199) Host is up (0.044s latency). Not shown: 986 closed ports PORT STATE SERVICE 25/tcp filtered smtp 465/tcp open smtps 587/tcp open submission 993/tcp open imaps 995/tcp open pop3s Nmap done: 1 IP address (1 host up) scanned in 1.87 seconds
Interesting thing that from my home pc I see that
25/tcp is opened and filtered but I can’t see it from
nmap‘s output on my VDS (where it comes from)? If I
telnet these ports, all of them are opened successfully.
I don’t expose
25 port for
mailu from the docker container, probably, this is the reason for the problem.
UPD: I have opened
25 port for
mailu and now
gmail sends email successfully and I receive it on my side. Why was it necessary?
You have multiple MX records. One points to your mail server, the other two point to GoDaddy’s mail servers.
Your mail server test at verifyemailaddress.org went to GoDaddy’s mail servers, not your own, because you didn’t have port 25 open, and thus your MX record could not be used.
It’s not clear why you have MX records pointing to GoDaddy if you are hosting your mail yourself.
You should remove the MX records which point to the wrong mail servers.
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.