THANK YOU VLADIMIR-SERVER, thank you for the tip, yes I do everything from scratch after I have post here on the forum and works good, smtp relay is my problem right now because a snakeoil.pem file that is not find. I will try to use 456 for SSL + WP SMTP + SSL RELAY + MAIL SERVER.

Thank you really much for the effort of helping me! I reinstalled again the aaPanel, I have created mail + site + domains + ssl + roundcube like I saw on this forum, works great even roundcube with new settings.

Now I try to make the path in Postfix to check the correct path in order for myself to use SMTP RELAY and to bind the SMTP relay to the SMTP WORDPRESS PLUGIN that are on the same server with aaPanel, this is what all I need to do.

When I use roundcube it works perfect and sending to the inbox, but when I open the smtp relay from aaPanel it not send because postfix try to autentificate to a .pem file that is not there πŸ™‚) for some reason, could be a bug I not know.

This is my postfix log: Apr 22 21:19:28 vmi1812900 postfix/smtps/smtpd[10567]: lost connection after CONNECT from unknown[94.207.106.37]
Apr 22 21:19:28 vmi1812900 postfix/smtps/smtpd[10567]: disconnect from unknown[94.207.106.37] commands=0/0
Apr 22 21:19:38 vmi1812900 postfix/smtps/smtpd[10567]: connect from unknown[211.228.113.27]
Apr 22 21:19:39 vmi1812900 postfix/smtps/smtpd[10567]: SSL_accept error from unknown[211.228.113.27]: -1
Apr 22 21:19:39 vmi1812900 postfix/smtps/smtpd[10567]: warning: TLS library problem: error:1417A0C1:SSL routines:tls_post_process_client_hello:no shared cipher:../ssl/statem/statem_srvr.c:2283:
Apr 22 21:19:39 vmi1812900 postfix/smtps/smtpd[10567]: lost connection after CONNECT from unknown[211.228.113.27]
Apr 22 21:19:39 vmi1812900 postfix/smtps/smtpd[10567]: disconnect from unknown[211.228.113.27] commands=0/0
Apr 22 21:19:51 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=10573, secured, session=<Wi1PUrQWCNF/AAAB>
Apr 22 21:19:51 vmi1812900 dovecot: imap(contact@alinaroman.ro)<10573><Wi1PUrQWCNF/AAAB>: Logged out in=173 out=1089 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
Apr 22 21:20:08 vmi1812900 postfix/smtpd[10576]: warning: /etc/postfix/main.cf, line 69: overriding earlier entry: relayhost=
Apr 22 21:20:08 vmi1812900 postfix/submission/smtpd[10576]: warning: error opening chain file: /etc/ssl/private/ssl-cert-snakeoil.key: No such file or directory
Apr 22 21:20:08 vmi1812900 postfix/submission/smtpd[10576]: connect from unknown[109.206.237.176]
Apr 22 21:20:08 vmi1812900 postfix/submission/smtpd[10576]: disconnect from unknown[109.206.237.176] ehlo=1 auth=0/1 rset=0/1 quit=1 commands=2/4
Apr 22 21:21:39 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=10588, secured, session=<dwvBWLQWouJ/AAAB>
Apr 22 21:21:39 vmi1812900 dovecot: imap(contact@alinaroman.ro)<10588><dwvBWLQWouJ/AAAB>: Logged out in=91 out=950 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0

    aaP_bobmarley4777 : This what I have in the folder that is checked by postfix for the pem file: root@vmi1812900:/etc/ssl/private# ls
    my-mail-server.key pure-ftpd-dhparams.pem pure-ftpd.pem
    root@vmi1812900:/etc/ssl/private#

    I have do what Kern do, thank you Kern, the openssl s_client -connect mail.135mailtest.com:587 -starttls smtp worked good an it output for me the key test.

    Now I setup the SMTP from Wordpress also the SMTP RELAY on port 587 TLS and I try to see if all work good, if not, I might output here the log of postfix.

    My logs after I send a test email from roundcube with smtp relay open looks like this: Action: failed
    Status: 5.4.0
    Remote-MTA: dns; mail.alinaroman.ro
    Diagnostic-Code: smtp; 554 5.4.0 Error: too many hops

    My mail log looks like this: Apr 22 23:16:59 vmi1812900 postfix/anvil[2928]: statistics: max cache size 2 at Apr 22 23:13:39
    Apr 22 23:17:39 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=3022, secured, session=<ixGa97UW3s9/AAAB>
    Apr 22 23:17:39 vmi1812900 dovecot: imap(contact@alinaroman.ro)<3022><ixGa97UW3s9/AAAB>: Logged out in=91 out=950 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
    Apr 22 23:18:39 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=3027, secured, session=<U8ks+7UWbOl/AAAB>
    Apr 22 23:18:39 vmi1812900 dovecot: imap(contact@alinaroman.ro)<3027><U8ks+7UWbOl/AAAB>: Logged out in=91 out=950 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
    Apr 22 23:19:07 vmi1812900 postfix/smtpd[3028]: warning: /etc/postfix/main.cf, line 69: overriding earlier entry: relayhost=
    Apr 22 23:19:07 vmi1812900 postfix/proxymap[3029]: warning: /etc/postfix/main.cf, line 69: overriding earlier entry: relayhost=
    Apr 22 23:19:07 vmi1812900 postfix/smtpd[3028]: warning: error opening chain file: /www/server/panel/plugin/mail_sys/cert/alinaroman.ro//www/server/panel/plugin/mail_sys/cert/alinaroman.ro/fullchain.pem: No such file or directory
    Apr 22 23:19:07 vmi1812900 postfix/smtpd[3028]: connect from unknown[109.206.237.176]
    Apr 22 23:19:07 vmi1812900 postfix/anvil[3030]: warning: /etc/postfix/main.cf, line 69: overriding earlier entry: relayhost=
    Apr 22 23:19:09 vmi1812900 postfix/smtpd[3028]: warning: unknown[109.206.237.176]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
    Apr 22 23:19:09 vmi1812900 postfix/smtpd[3028]: disconnect from unknown[109.206.237.176] ehlo=1 auth=0/1 quit=1 commands=2/3
    Apr 22 23:19:39 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=3034, secured, session=<BdTA/rUWlql/AAAB>
    Apr 22 23:19:39 vmi1812900 dovecot: imap(contact@alinaroman.ro)<3034><BdTA/rUWlql/AAAB>: Logged out in=91 out=950 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
    Apr 22 23:20:39 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=3045, secured, session=<sbZSArYWgqR/AAAB>
    Apr 22 23:20:39 vmi1812900 dovecot: imap(contact@alinaroman.ro)<3045><sbZSArYWgqR/AAAB>: Logged out in=91 out=950 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0
    Apr 22 23:21:02 vmi1812900 dovecot: imap-login: Login: user=contact@alinaroman.ro, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=3047, secured, session=<DFK0A7YWIq1/AAAB>
    Apr 22 23:21:02 vmi1812900 dovecot: imap(contact@alinaroman.ro)<3047><DFK0A7YWIq1/AAAB>: Logged out in=91 out=950 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0

      I think my server is loop to many times because I use all eggs into the same server, any tips? I have no idea how to fix this right not, I need to check up the internet.

      I have found something, my config file of postfix is not good I think because "mydestination" is empty, I think should be localhost or 127.0.0.1, maybe Kern knows something about this, I try to check myself on internet how to make it not loop in "walls".

      All my eggs/servers are in same place so I need to configure this to "flow" good.

      -myhostname = vmi1812900.contaboserver.net
      alias_maps = hash:/etc/aliases
      alias_database = hash:/etc/aliases
      myorigin = /etc/mailname
      mydestination =
      relayhost =
      mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
      mailbox_command = procmail -a "$EXTENSION"
      mailbox_size_limit = 0
      recipient_delimiter = +
      inet_interfaces = all

      inet_protocols = all

      After some tweaks, it sends from email1 to email1, looping : 20240423011637.7229B2001B97@vmi1812900.contaboserver.net: stored mail into mailbox 'INBOX'
      Apr 23 03:16:37 vmi1812900 postfix/lmtp[4502]: 7229B2001B97: to=contact@alinaroman.ro, relay=vmi1812900.contaboserver.net[private/dovecot-lmtp], delay=0.04, delays=0/0.01/0.01/0.01, dsn=2.0.0, status=sent (250 2.0.0 contact@alinaroman.ro zo9mHfULJ2aXEQAA46gUhQ Saved)
      Apr 23 03:16:37 vmi1812900 dovecot: lmtp(4503): Disconnect from local: Client has quit the connection (state=READY)
      Apr 23 03:16:37 vmi1812900 postfix/qmgr[4451]: 7229B2001B97: removed

      check the postfix configuration, which can be viewed in the server status
      "mail.135mailtest.com" is replaced with your domain name
      Put:
      smtpd_tls_chain_files=/etc/ssl/private/ssl-cert-snakeoil.key,/etc/ssl/certs/ssl-cert-snakeoil.pem
      Change to:
      smtpd_tls_chain_files = /www/server/panel/plugin/mail_sys/cert/135mailtest.com/privkey.pem,/www/server/panel/plugin/mail_sys/cert/135mailtest.com/fullchain.pem
      Note to replace 135mailtest.com with your domain name.
      Also check /www/server/panel/plugin/mail_sys/cert/135mailtest.com/ for privkey.pem and fullchain.pem files

      aaP_bobmarley4777

      Thank you Kern, I have put the path and it takes it, now I try to check again how is going and I might get back to the forum with my last resolution. Ty

      Here is a video of working roundcube with smtp relay OFF, and after smtp Relay ON my email not send to the gmail inbox.

      What do you Think Kern, have you encounter those kind things, what I should do to fix this to make my smtp relay work on aApanel, any help will be great.

      Video: https://vimeo.com/938043334?share=copy

        Also my server send to gmail to inbox but on yahoo not receive anything

        I need to use port 25 by default for SMTP RELAY or SMTP, where I can change to have 25 the port for my internal email servers and to use 587 for the secured external email traffic?

        SuperTool Beta7

        alinaroman.ro

        mx:alinaroman.ro
        Gmail & Yahoo are now requiring DMARC - Get your's setup with Delivery Center

        Pref Hostname IP Address TTL
        10 mail.alinaroman.ro 62.169.30.22
        Unknown (AS51167) 24 hrs Blacklist Check SMTP Test
        Test Result
        Status Ok DMARC Record Published DMARC Record found
        Status Ok DMARC Policy Not Enabled DMARC Quarantine/Reject policy enabled
        Status Ok DNS Record Published DNS Record found

        220 vmi1812900.contaboserver.net ESMTP Postfix (Ubuntu)
        Test Result
        Status Ok SMTP Reverse DNS Mismatch OK - 62.169.30.22 resolves to vmi1812900.contaboserver.net
        Status Ok SMTP Valid Hostname OK - Reverse DNS is a valid Hostname
        Status Ok SMTP Banner Check OK - Reverse DNS matches SMTP Banner
        Status Ok SMTP TLS OK - Supports TLS.
        Status Ok SMTP Connection Time 0.349 seconds - Good on Connection time
        Status Ok SMTP Open Relay OK - Not an open relay.
        Status Ok SMTP Transaction Time 1.108 seconds - Good on Transaction Time
        Session Transcript:
        Connecting to 62.169.30.22

        220 vmi1812900.contaboserver.net ESMTP Postfix (Ubuntu) [204 ms]
        EHLO keeper-us-east-1d.mxtoolbox.com
        250-vmi1812900.contaboserver.net
        250-PIPELINING
        250-SIZE 102400000
        250-VRFY
        250-ETRN
        250-STARTTLS
        250-AUTH PLAIN LOGIN
        250-ENHANCEDSTATUSCODES
        250-8BITMIME
        250-DSN
        250-SMTPUTF8
        250 CHUNKING [217 ms]
        MAIL FROM:supertool@mxtoolboxsmtpdiag.com
        250 2.1.0 Ok [216 ms]
        RCPT TO:test@mxtoolboxsmtpdiag.com
        554 5.7.1 test@mxtoolboxsmtpdiag.com: Relay access denied [226 ms]

        LookupServer 1788ms

        I'm stucked with this contabo DNS setup, I not know where is the error and why SMTP RELAY when is open not work

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