2 months ago
Hello Railway Support Team,
I have a Passbolt service running on Railway and need to send emails through Mailgun SMTP.
However, outbound SMTP connections from inside the container are timing out. I tested multiple SMTP providers and ports directly from the running container:
smtp.mailgun.org:587 → Connection timed out
smtp.mailgun.org:2525 → Connection timed out
smtp.mailgun.org:465 → Connection timed out
smtp.gmail.com:587 → Connection timed out
smtp.sendgrid.net:2525 → Connection timed out
Example test result:
php -r '$s=@stream_socket_client("tcp://smtp.mailgun.org:2525",$e,$m,10); var_dump((bool)$s,$e,$m);'
bool(false)
int(110)
string(20) "Connection timed out"
php -r '$s=@stream_socket_client("tcp://api.mailgun.net:443",$e,$m,10); var_dump((bool)$s,$e,$m);'
I enabled Outbound IPv6 as well, but smtp.mailgun.org does not return an IPv6/AAAA record.
Could you please verify whether there is any outbound SMTP/egress restriction, firewall rule, routing issue, or IP-level filtering affecting TCP ports 465, 587, and 2525 from my Railway service/region?
My application depends on authenticated SMTP for Passbolt invitations, password recovery, and notifications.
Thank you.
2 Replies
2 months ago
Outbound SMTP is only available on the Pro plan and above; it is disabled on Free, Trial, and Hobby plans. For sending emails from your application, please use a dedicated email service that provides an HTTPS API (Mailgun itself offers one). More details are in our outbound networking docs.
Status changed to Awaiting User Response Railway • 2 months ago
Railway
Outbound SMTP is only available on the Pro plan and above; it is disabled on Free, Trial, and Hobby plans. For sending emails from your application, please use a dedicated email service that provides an HTTPS API (Mailgun itself offers one). More details are in our [outbound networking docs](https://docs.railway.com/networking/outbound-networking).
2 months ago
I performed the procedure and the ports failed
root@a0a986e5cba7:/usr/share/php/passbolt# SMTP_HOST="$smtp.mailgun.org" bash -c '
for port in 25 465 587 2525; do
timeout 1 bash -c "</dev/tcp/$SMTP_HOST/$port" 2>/dev/null && \
echo "$SMTP_HOST port $port reachable" || \
echo "$SMTP_HOST port $port unreachable"
done
'
.mailgun.org port 25 unreachable
.mailgun.org port 465 unreachable
.mailgun.org port 587 unreachable
.mailgun.org port 2525 unreachable
root@a0a986e5cba7:/usr/share/php/passbolt# SMTP_HOST="smtp.mailgun.org" bash -c '
for port in 25 465 587 2525; do
timeout 1 bash -c "</dev/tcp/$SMTP_HOST/$port" 2>/dev/null && \
echo "$SMTP_HOST port $port reachable" || \
echo "$SMTP_HOST port $port unreachable"
done
' smtp.mailgun.org port 25 unreachable
smtp.mailgun.org port 465 unreachable
smtp.mailgun.org port 587 unreachable
smtp.mailgun.org port 2525 unreachable
root@a0a986e5cba7:/usr/share/php/passbolt#
Status changed to Awaiting Railway Response Railway • 2 months ago
Status changed to Solved rodrigo-bj-remax • 2 months ago