Can't send or receive e-mail

Hi guys
I’ve reinstalled my server with a clean Ubuntu SVR and CP 2.1.1.
Everything works well but emails.
Can’t make the server send or receive on my domain (technovores.com).

DNS records seem OK
Firewall is OK
Ports are correctly forwarded
No SSL issue

Email I send to the serveur bounced (The recipient server did not accept our requests to connect.)
Rainloop was working but is telling now that the account is not allowed since I’ve done the chmod fix (chown -R cyberpanel:cyberpanel /usr/local/CyberCP/lib/python3.6/site-packages/tldextract/.suffix_cache) to give cyberpanel ownership to some files.
Any idea where I could investigate to troubleshoot this issue ?
I’m stuck, can’t get email for my small company, It’s a big issue for me

David

AWS, Google Cloud and DigitalOcean blocks email ports. So make sure that is not the case.

If that is not the case then use this guide to debug the problem → Troubleshooting CyberPanel - 14 - Logging & Troubleshooting - CyberPanel Community

You were right Usman Nasir. 25 is blocked by service provider …
Is there a workaround to use another port to make smtp work?

Try our old article → Setup External SMTP on Google Cloud Platform (GCP) - #2 - Blog Posts - CyberPanel Community

But this article is for an advanced user.

Thanks. I dit change the port to 2525, but still no success. Here is the result I get when I check postfix logs:

May 01 21:00:27 actarus postfix/smtp[1882]: connect to alt2.gmail-smtp-in.l.google.com[209.85.202.26]:25: Connection timed out
May 01 21:00:27 actarus postfix/smtp[1882]: 87EFA1CE0C26: to=<REPLACED @gmail.com>, relay=none, delay=91, delays=0.38/0.01/90/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[209.85.202.26]:25: Connection timed out)
May 01 21:02:17 actarus postfix/anvil[1865]: statistics: max connection rate 4/60s for (submission:66.115.145.55) at May 1 20:57:05
May 01 21:02:17 actarus postfix/anvil[1865]: statistics: max connection count 4 for (submission:66.115.145.55) at May 1 20:57:05
May 01 21:02:17 actarus postfix/anvil[1865]: statistics: max cache size 1 at May 1 20:57:05

I would recommend you to choose a provider with no restriction on port 25, because every other solution is for an advanced user. So better change your provider.

My provider told me that they block it for safety reasons. They offer their own SMTP relay. Is their a way to use it in CyberPanel ?

You can use this guide Configure Postfix to Send Email Using External SMTP Servers | Linode

CyberPanel use postfix.

@usmannasir i have used Sendinblue smtp to fix this issue , now I cant able configure my mail account with outlook email client please help me fix this issue