How do I authenticate using port 587

[spectra]

zmprov ms mail.server.org zimbraMtaRelayHost mail.server.com:25;
echo mail.server.com uid@server.comassword > /opt/zimbra/conf/relay_password;

postmap hash:/opt/zimbra/conf/relay_password;
postmap -q mail.server.com /opt/zimbra/conf/relay_password;
postconf -e smtp_sasl_password_maps=hash:/opt/zimbra/conf/relay_password;

postconf -e smtp_sasl_auth_enable=yes;
postconf -e smtp_use_tls=yes;
postfix reload;
postconf -e smtp_cname_overrides_servername=no;
postconf -e smtp_sasl_security_options=noanonymous;
postfix reload;

zmlocalconfig -e postfix_smtp_sasl_password_maps=hash:/opt/zimbra/conf/relay_password;
zmlocalconfig -e postfix_smtp_sasl_auth_enable=yes;
zmlocalconfig -e postfix_smtp_use_tls=yes;
zmlocalconfig -e postfix_smtp_cname_overrides_servername=no;
zmlocalconfig -e postfix_smtp_sasl_security_options=noanonymous;

zmprov mcf zimbraLastLogonTimestampFrequency 1h;
zmprov mcf zimbraDefaultDomainName server.org;
zmprov mc default zimbraFeatureCalendarReminderDeviceEmailEnabled TRUE;

Guys, I use the above script to have zimbra authenticate and send emails outbound just fine. The problem now is that the ISP started to block port 25. The account is running on a dynamic IP. All worked well until the ISP started blocking port 25.

Now, is there a way to tell my script to use port 587. I've tried to just add 587 everyplace there is a reference to mail.server.com:587. That didn't work.

thanks in advance

[Labsy]

My very, very rough guess would be, that 587 is not just supplement for port 25, but requires authentication via TLS with user/server cert.
Instead you may use port 465, which just openes SSL tunel nad is more like comm over port 25.

[tribear]

In the past I have used DynDNS mail hop to get around AT&T port 25 block and used 2525 to route mail through thier service. Inexpensive solution to *%&! ISP's.

Today I have a AT&T business dsl account at a lower rates and /29 subnet too. Check out today's lower rates and consider just going directly out on your own public "static" IP's. You get back port 25... :-)