Sender-dependent transport / Spam issue

Phil

Hi,

I use self-hosted mailcow server with my Internet Access Provider (iap) adress mail like “name@iap.fr” with sender-dependent transport “smtp.iap.fr:587”.

The test results of the SMTP transmission is ok, i see :
SERVER -> CLIENT: 250 2.0.0 k380rSxxxxxxx mail accepted for delivery.

…Unfortunately sometimes emails arrives in the receiver’s spam folder.

Please could you help in configuring correctly my settings ?
I think the issue concerns address rewritting but I’m not sure !
Is there a complete tuto regarding this subject ?

Thanks for your help,
Phil

DocFraggle

If I understand correctly you are running your mailcow at home with your local ISP? That’s never a good idea as there are a lot of SMTP blacklists containing the ISP network ranges. You have to use a relay service to send your mails, otherwise most of your sent emails will be flagged as SPAM…

In case I didn’t understand: is smtp.iap.fr:587 your relay service?

Phil

DocFraggle
My server is not running at home but at the moment on a Contabo Virtual Private Server.
Yes, i use my ISP/IAP smtp services for outgoing emails with a sender-dependant transport setting adress : smtp.iap.fr:587
So i think my issue isn’t coming from IP blacklisting
I suspect it comes from address rewriting in the message header….

[unknown]
Thanks for this alternative
If i’s possible to solve this spam issue, I would prefer to use my provider’s SMTP for outgoing emails

maybl8

I have a server running at home also.
I use sendgrid for sending my emails.

DocFraggle

Did you ever get the mail header of one of your recipients where your mail was flagged as SPAM? Maybe you can find a hint there if you check the X-SPAM* headers