Timeout Queue Send email

lcristovam

Hi Mailcowers : )

I am having trouble sending emails in my application, I have the error below in the queue queue for all the destinations I tested (outlook and gmail).

As it is a timeout, the first thing that comes to mind are Firewall rules. I configured a rule to allow all outbound protocols in my provider that hosts Mailcow (Google GCP Platfform) and tested the ping to several addresses like outloook and gmail, being successful. Still, I’m having the same timeout problems.

What could it be? Is there anything necessary to do within mailcow.conf to list my VPS network settings within Google Cloud Platform?

lcristovam

an observation for GCP Platform: the 25 port is blocked for default. i am receiving e-mails normally

MAGIC

Seems GCP doesn’t allow port 25 at all :/
https://cloud.google.com/compute/docs/tutorials/sending-mail/

lcristovam

MAGIC
what do you recommend me to do? There is the possibility of ports 587 and 465

Using Sendgrid it is also an option

MAGIC

Ports 587,465 is for your mailclients. You can use sendgrid for relaying your mails if you want or use a provider which doesnt block port 25

lcristovam

MAGIC Do you know of a free VPS provider that can do this?

lcristovam

is there a possibility for me to use a random port in addition to the 25 (Ex: 1549)? is there any impact on that?

MAGIC

People who wants to send mail to you needs to know this new port too, so it’s unlikely that big companies like Google or Microsoft are changing it.

lcristovam

MAGIC but if i just wanna send emails, dont need receive, can be ?

I have changed de smtp port on mailcow.conf to 999, but the timeout persists with the same error

tbrummell

lcristovam No, your VPS provider is blocking outbound destination port 25. This is in an effort to combat spammers.
Contact your provider and ask the restriction to be removed, that is all you can do. Or move to another VPS provider that allows outbound 25.