Take mailgun as an example here If your server cannot open port 25, you can try to use SMTP relay Step1 Access the official website of MailGun https://www.mailgun.com/ and click the Start Sending button to register a mailgun account Step2 Log in after registering an account, enter the management background and find SMTP credentials as shown below Step3 Fill in the information of Username and password to the mail server, as shown below Now we can try to send an email

wow thanks aapanel, its possible restore inbox from cpanel? 😃

bakuldesign Let's first look at how cpanel records emails

can we use it as another aapanel relay server

yclywz41 We haven’t tested it yet, you can give it a try

I confiigured and import dns record from mailgun to cloudflare. My mail server opening port 110,993,995,25,465,587 Mail abc.xyz can send to gmail and yahoo But gmail and yahoo can't send to mail abc.xyz. Please help me, thanks you very much

How to use the mail server relay function

aaPanel_Jose

daydien789
Is your mail relayed through mailgun

NoobRogue

hy aaPanel_Jose this mail gun relay, can we use for more than one mail server ?

aaP_odiditech

aaPanel_Jose plz i need your help,
i cant send msg in my mail server.

""Some cloud vendors (such as Google, Am azon) close port 25 by default, and you ne ed to contact the vendor to open port 25 before you can use the post office service normally""

H_Csaba

This email service a big scam!
Get bank card... IF SPAMMER... prevention.... deaf chatter!!
If service realy free... I do NOT require a credit card for it, but i solve that you can only send max 5000 letters per month!
it's a joke!

voymacao

@H_Csaba Mailgun is just an example, you can use any other SMTP provider. To name a few, Sendinblue, Sparkpost, Sendgrid, Elastic, Pepipost, Amazon SES etc. All of them require similar process, you need to bind the sending domain with thei DNS records they provide, and most have a limited free tier. SMTP should also work with the free webmail providers, such as Gmail or Yandex, though i didn't test it yet. Be aware that emails sent from SMTP relays use the provider's sending IP address, which might be shared with other senders too. If this IP is used for spamming, your domain reputation might be affected.

H_Csaba

voymacao
perfect is normaly Public ip... 😉

rkjha

You are a lifesaver.

aifslaos

Is Bluemail server is support web version

aaPanel_Jose

aaP_odiditech
please check your server if you can access the other server 25 port

ubuntu/debian
apt install -y telnet && telnet smtp.gmail.com 25

centos
yum install -y telnet && telnet

If you see the following information, it means you can access port 25 of other mail servers

maverick

telnet is a deprecated, insecure tool, should not be used today. There are a number of alternatives that do exactly the same.
You can use curl, like:
curl -vv telnet://smtp.gmail.com 25

Or a better choice, netcat (nc)

% nc smtp.gmail.com 25
220 smtp.gmail.com ESMTP q4sm20247148wrs.56 - gsmtp
QUIT
221 2.0.0 closing connection q4sm20247148wrs.56 - gsmtp

But my favourite for this kinds of tests, where we connect to the port 25 and test starttls using openssl s_client:

% openssl s_client -connect smtp.gmail.com:25 -starttls smtp
CONNECTED(00000005)
depth=2 C = US, O = Google Trust Services LLC, CN = GTS Root R1
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=1 C = US, O = Google Trust Services LLC, CN = GTS CA 1C3
verify return:1
depth=0 CN = smtp.gmail.com
verify return:1
---
Certificate chain
 0 s:CN = smtp.gmail.com
   i:C = US, O = Google Trust Services LLC, CN = GTS CA 1C3
 1 s:C = US, O = Google Trust Services LLC, CN = GTS CA 1C3
   i:C = US, O = Google Trust Services LLC, CN = GTS Root R1
 2 s:C = US, O = Google Trust Services LLC, CN = GTS Root R1
   i:C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
---
Server certificate
-----BEGIN CERTIFICATE-----
...
kI874CaqNTs=
-----END CERTIFICATE-----
subject=CN = smtp.gmail.com

issuer=C = US, O = Google Trust Services LLC, CN = GTS CA 1C3

---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ECDSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 4569 bytes and written 429 bytes
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 256 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
---
250 SMTPUTF8

QUIT
DONE

softnya

I reinstalled the mail server and reset all to default, but when I set smtp relay I have this error:
The smtp relay already exists

What could be wrong?

aaPanel_Kern

softnya
Hello, check whether the last content of this /etc/postfix/main.cf file has the following information, if so, please delete it and set it again
#BEGIN_POSTFIX_RELAY
xxx
#END_POSTFIX_RELAY

murshid99

I am using Azure Server, here port 25 is blocked for spam.

After that I tried to use SMTP relay for mail server, I used Mailgun and Sendgrid but none of it worked. I getting the same error. as above.
This is how the code looks like
#BEGIN_POSTFIX_RELAY relayhost = [smtp.mailgun.org]:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = static:xxxxxxxxxx:XXXXXXXXXX smtp_sasl_security_options = noanonymous #END_POSTFIX_RELAY

Please help me resolve the issue

aaP_krishan_cj

i have the same issue not receiving emails. can anyone help me ?

aaPanel_Kern

aaP_krishan_cj
At the same time, 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

You can use this command to check whether the correct SSL is configured
openssl s_client -connect mail.135mailtest.com:587 -starttls smtp
or
openssl s_client -connect mail.135mailtest.com:465 -starttls smtp

If the display is not OK, please re-apply for SSL

Unable to send dkim headers
Troubleshoot log /var/log/rspamd/rspamd.log
Prompt for permission issues:
2022-04-20 00:27:56 #1363(rspamd_proxy) <6795e9>; proxy; dkim_module_load_key_format: cannot load dkim key /www/server/dkim/xx.com/default.private: cannot map key file: '/www /server/dkim/xx.com/default.private' Permission denied

Set 640 to 644, then restart rspamd to send emails to view the email source code, please replace xxx.com with your domain name.

chmod 644 /www/server/dkim/xx.com/default.private systemctl restart rspamd

Use this website to check whether the records of DKIM and SPF are correct?
https://www.dmarcanalyzer.com/dkim/dkim-checker/
https://dnschecker.org/spf-record-validation.php

Check the mail score and troubleshoot according to its error message
https://www.mail-tester.com/

Check blacklists
https://mxtoolbox.com/

target_stj

I am using the Brevo SMTP relay but i am not able send the mails using mail server. I am getting port 25 sholud be opend by the isp vendor. Help me to fix this error.

aaPanel_Kern

Hello, we can't solve this problem, we need your ISP provider to help you solve it

target_stj

benalves

aaPanel_Jose I did the same process but using Oracle mail service and I am still facing the same issue.
Can you help with that?

aaPanel_Kern

benalves
It is recommended that you consult your service provider

aaP_syahdanhidayat

Hello @aaPanel_Kern A month ago I successfully sent email, but this week I installed on a new server can't use mailgun anymore. how is that any other solution? other than mailgun? email can't be sent.

aaPanel_Kern

Hello, generally it only needs to be a relay that postfix can use.

aaP_syahdanhidayat