Old 18th November 2011, 00:34
jessesalazar jessesalazar is offline
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Default Problem port 25

I've followed the tutorial perfect server ubuntu 11.04, and everything is working pretty good, But when I send a message or receive from my external account it doesn't work, because my ISP is blocking the port 25, so, I went to no-ip webpage and add an "alternate smtp" and "reflector", now I can receive message using the port 587, but when I setup the main.cf to use auth sasl, like no-ip said, sending message doesn't work. here is the setup for smtp:
Use the following settings:

Outgoing SMTP Server: smtp-auth.no-ip.com
Port Number: 3325 or 587
Username: yourdomain.com@noip-smtp
Password: <Set on No-IP.com, see above.
Defaults to your No-IP account password>

smtp_sasl_auth_enable = yes
relayhost = [mail.isp.example]
# Alternative form:
# relayhost = [mail.isp.example]:submission
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

# destination credentials
[mail.isp.example] usernameassword
# Alternative form:
# [mail.isp.example]:submission usernameassword

What else do I need to do?

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Old 1st December 2011, 12:02
eko_taas eko_taas is offline
Join Date: Feb 2011
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Default receiving port 25 easy workaround

I found easy solution for my receiving problem (blocked port 25) from

to shell (as su)
# iptables -t nat -A PREROUTING -p tcp --dport 587 -j REDIRECT --to-ports 25
Inspired by DydDNS discounts, I took 1y for EmailGateway
Zone Service
example.com Dyn Email Gateway to example.com:587
Also I made MX settings on domain DNS
MX @ mx1.mailhop.org
MX @ mx2.mailhop.org
Now I should find out how to add that to ISPConfig firewall-script (that applies also on reboot...) - anyone with good advice, let me know (I found only quote old howtoforge-posts...)
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Old 7th December 2011, 04:22
eko_taas eko_taas is offline
Join Date: Feb 2011
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Default Firewall script

Could solve permanent issue based on mini-howto long time back:

Now I can receive and send my emails w/o ISP issues (seems that outgoing port not yet problem for them even if told so.....)
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Old 7th December 2011, 15:10
eko_taas eko_taas is offline
Join Date: Feb 2011
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Default now I needed smtp-relay as well

My ISP closed sending port after few trials, so now I added relay as well.

Got it running w/o pain based on

I am using one of my (new/extra) ISP-email-accounts just to login to ISP's smtp (as relay i.e normal ports OK).....

Now now both receiving and sending working like a charm for all server1-accounts
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