Configured postfix for email forwarding now getting socket error

I have postfix configured for mail forwarding on my linode and I'm getting the error below when sending [some] emails (it would appear most emails I send do work properly and I don't believe I have an issue receiving mail at all - weird!):

Technical details of temporary failure:

The recipient server did not accept our requests to connect. Learn more at http://support.google.com/mail/bin/answ … nswer=7720">http://support.google.com/mail/bin/answer.py?answer=7720

[(0) domain1.com. [45.79.xxx.xxx]:587: socket error]

[(0) domain1.com. [2600:3c02::f03c:91ff:xxxx:xxxx]:587: socket error]

I followed the postfix tutorials here the best I could but I must admit my linux skills are a bit rusty.

I've also noticed my SSH sessions are freezing up after a few minutes. It didn't seem to do this before… I get Network Error: Software caused connection abort

Here's my mail configuration:

root@zeus:/var/log# postconf -n

alias_database = hash:/etc/aliases

alias_maps = hash:/etc/aliases

appenddotmydomain = no

biff = no

config_directory = /etc/postfix

home_mailbox = mail/

inet_interfaces = all

inet_protocols = all

mailboxsizelimit = 0

mydestination = localhost, localhost.localdomain, , localhost

myhostname = zeus.domain1.com

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 45.79.xxx.xxx

readme_directory = no

recipient_delimiter = +

relayhost =

smtptlssessioncachedatabase = btree:${datadirectory}/smtpscache

smtpdbanner = $myhostname ESMTP $mailname (Ubuntu)

smtpdrecipientrestrictions = permitsaslauthenticated permitmynetworks rejectunauth_destination

smtpdrelayrestrictions = permitsaslauthenticated permitmynetworks rejectunauth_destination

smtpdtlscert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem

smtpdtlskey_file = /etc/ssl/private/ssl-cert-snakeoil.key

smtpdtlssessioncachedatabase = btree:${datadirectory}/smtpdscache

smtpdusetls = yes

virtualaliasdomains = domain1.com, domain3.com, domain2.com

virtualaliasmaps = hash:/etc/postfix/virtual

–------------------------------

root@zeus:/var/log# netstat -ntlp

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 1957/mysqld

tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 1880/dovecot

tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 1880/dovecot

tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1886/sshd

tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 2060/master

tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 1880/dovecot

tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 1880/dovecot

tcp6 0 0 :::110 :::* LISTEN 1880/dovecot

tcp6 0 0 :::143 :::* LISTEN 1880/dovecot

tcp6 0 0 :::22 :::* LISTEN 1886/sshd

tcp6 0 0 :::25 :::* LISTEN 2060/master

tcp6 0 0 :::993 :::* LISTEN 1880/dovecot

tcp6 0 0 :::995 :::* LISTEN 1880/dovecot

root@zeus:/var/log# iptables -L -n -v

Chain INPUT (policy ACCEPT 2535 packets, 237K bytes)

pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 2350 packets, 360K bytes)

pkts bytes target prot opt in out source destination

Hoping somebody with a little more experience could possibly shed light on any mistakes I may have made.