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Hello. I would like to ask. Is there any way to configure postfix on an PMG server to receive the response messages from the destination server that the mail has been sent to? For example if the mail has been dropped and the reason or has been accepted for delivery ?

Hello PMG should be put in front of Exchange and work on port 25 for inbound mail and then will forward the mails to Exchange. OWA and EWS have nothing to do with PMG.

Internet --> Port 25 (PMG) --> Mail Server Mail Server --> Port 26(PMG) -->Internet

- Configuration -> Mail Proxy -> Whitelist

You are welcome.

https://forum.proxmox.com/threads/pmg-dkim-config.90765/#post-462625

What is your mail server?

Hello I have found it out. What is causing the DKIM to fail is the antivirus check from Watchguard firewall. I had enabled an outgoing rule to scan the messages. Since i disabled it DKIM works fine.

Thank you from me as well. Works perfect...

Exchange server is not having DKIM. In fact in local dns (DOMAIN CONTROLLER) i have put the same TXT for DKIM record as it is in our pubic DNS provider.

Mail Client --> Send to mail server --> Mail server relays to PMG smart host --> PMG signs DKIM and sends. PMG on Exchange is Smarthost This is what i get from google Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@domain.com header.s=hg...

I used this one and its working for me. https://www-sysadminsdecuba-com.translate.goog/2018/07/configurando-dkim-sobre-proxmox-mail-gateway/amp/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp If i send email from inside the pmg command prompt the mail is signed with DKIM. But if i...

filename=.*\.(ace|adp|app|asp|ba[st]|cer|chm|cmd|cnt|com|cpl|crt|csh|der|dll|exe|fxp|gadget|hlp|hpj|hta|in[fs]|img|isp|its|jse?|ksh|lnk|ma[dfgmqrstuvw]|md[detwz]|msc|msh|mshxml|msh[12]|msh[12]xml|ms[ipt]|ops|osd|pcd|pif|plg|prf|prg|pst|reg|sc[frt]|sh[bs]|ps[12]|ps[12]xml|psc[12|]tmp|url|vb[eps]?|...

Hello I have setup the DKIM in pmg. I have created a DKIM record using an online generator. In DNS settings in a TXT record i have created the DKIM record (public key) and also in private in pmg i have copied the private key. We have Ms Exchange 2016 and all emails use the PMG as gateway. I...

Your PMG is behind NAT or has a public ip?

Check Watchguard. And go to SMTP Proxy and allow gmail.com

It works like this Internet-> Firewall->Proxmox Mail Gateway->Exchange

I would like to ask you, what configuration have you done in order the ciphermail to work with proxmox mail gateway? Right now the configuration i have and working is Internet -> Firewall -> Proxmox Mail Gateway -> Exchange

Have you tried to disconnect the network from VM and then reconnect it from the settings on the virtual machine?

ok good then