Unable to connect to outgoing SMTP server

[audiodef]

I run my own mail server. There's only one part that isn't working and I can't seem to figure out why: sending mail from a client - in this case, Thunderbird.

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[audiodef]

I can send mail off-server just fine if I log in via telnet. I can receive email just fine with Thunderbird.

Here are my relevant configs:

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[audiodef]

/etc/postfix/main.cf:

queue_directory = /var/spool/postfix
message_size_limit = 102400000
mailbox_size_limit = 1024000000
command_directory = /usr/sbin
daemon_directory = /usr/lib64/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
default_privs = nobody
myhostname = audiodef.com
mydomain = audiodef.com
virtual_mailbox_domains = audiodef.com
myorigin = $myhostname
alias_maps = mysql:/etc/postfix/validate.cf
virtual_mailbox_maps = mysql:/etc/postfix/validate.cf
mailbox_transport = lmtp:unix:/var/imap/socket/lmtp
virtual_transport = lmtp:unix:/var/imap/socket/lmtp
inet_interfaces = all
mydestination = $myhostname, localhost
local_recipient_maps = $alias_maps, $virtual_mailbox_maps
unknown_local_recipient_reject_code = 550
mynetworks = 209.177.157.239, 127.0.0.0/8
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_authenticated_header = yes
broken_sasl_auth_clients = yes
smtpd_tls_auth_only = yes
mail_spool_directory = /var/spool/mail
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
local_destination_concurrency_limit = 2
default_destination_concurrency_limit = 20
debug_peer_level = 2
debugger_command =
         PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
         ddd $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
smtpd_tls_security_level = may
smtpd_tls_cert_file = /etc/ssl/postfix/server.crt
smtpd_tls_key_file = /etc/ssl/postfix/server.key
#smtpd_tls_CAfile = /etc/ssl/postfix/root.crt
smtpd_tls_ask_ccert = no
smtpd_tls_loglevel = 1
smtpd_recipient_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        reject_unauth_destination
biff = no
empty_address_recipient = MAILER-DAEMON
tls_random_source = dev:/dev/urandom
smtp_tls_note_starttls_offer = yes

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[audiodef]

/etc/postfix/master.cf:

smtp      inet  n       -       n       -       -       smtpd
pickup    fifo  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
        -o smtp_fallback_relay=
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache

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[audiodef]

/etc/imapd.conf:

configdirectory:        /var/imap
partition-default:      /var/spool/imap
sievedir:               /var/imap/sieve
admins: damien@audiodef.com
tls_ca_path:            /etc/ssl/certs
tls_cert_file:          /etc/ssl/cyrus/server.crt
tls_key_file:           /etc/ssl/cyrus/server.key
virtdomains: on
hashimapspool:          yes
allowanonymouslogin:    no
allowplaintext:         yes
allowusermoves:         yes
autocreatequota: 1024000000
createonpost: yes
sasl_pwcheck_method: auxprop
sasl_auxprop_plugin: sql
sasl_sql_engine: mysql
sasl_mech_list: LOGIN PLAIN
sasl_sql_user: maildb
sasl_sql_passwd: (mypass)
sasl_sql_database: maildb
sasl_sql_hostnames: localhost
sasl_sql_select: SELECT plainpass FROM aliases WHERE email = '%u@%r'

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[audiodef]

/etc/cyrus.conf:

START {
  # Do not delete this entry!
  recover       cmd="ctl_cyrusdb -r"
}

SERVICES {
  # Add or remove based on preferences.
  imap          cmd="imapd" listen="imap2" prefork=0
  pop3          cmd="pop3d" listen="pop-3" prefork=0

  # Don't forget to generate the needed keys for SSL or TLS
  # (see doc/html/install-configure.html).
  imaps         cmd="imapd -s" listen="imaps" prefork=0
  pop3s                cmd="pop3d -s" listen="pop3s" prefork=0
  lmtpunix      cmd="lmtpd" listen="/var/imap/socket/lmtp" prefork=0
}

EVENTS {
  checkpoint    cmd="ctl_cyrusdb -c" period=30
  delprune      cmd="ctl_deliver -E 3" period=1440
  tlsprune      cmd="tls_prune" period=1440
}

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[audiodef]

/etc/sasl2/smtpd.conf:

pwcheck_method: auxprop
auxprop_plugin: sql
mech_list: PLAIN LOGIN 
sql_engine: mysql
sql_hostnames: 127.0.0.1
sql_user: maildb
sql_passwd: (mypass)
sql_database: maildb
sql_select: SELECT plainpass FROM aliases WHERE email = '%u@%r'

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[audiodef]

Thunderbird outgoing mail server:
server name: audiodef.com
port: 25
connection security: starttls
authentication method: normal password
user name: (one of my working email addresses on my server)

I've actually tried various combinations of outgoing mail server settings, none of which worked.

I would greatly appreciate any help. I've been without mail for a few days and I'm now done with setting things up, except for this outgoing mail server problem.

[audiodef]

Finally.

Note: I used the following guide to set up my mail server: Gentoo Documentation - Postfix with Cyrus IMAP, ESMTP Authentication, and All Other Basics

[audiodef]

Normally, I delete threads in which I'm just talking to myself, but since that's not an option here, I wanted to post the solution:

Verizon, the ISP I use, blocks port 25. I simply had to add

submission inet n - n - - smtpd

to Postfix's master.cf to enable use of port 587 with TLS for SMTP.