Postfix + Microsoft Outlook [Connects to incoming server, but not outgoing]

I followed this tutorial to install Postfix to prepare myself to be able to once again use Microsoft Outlook to check emails.

I think most of it is set up correctly. Through adding a new account in Outlook, I am able to successfully connect to the incoming mail server. However, I am unable to connect to the outgoing (SMTP) mail server. Both servers are listed as “mmaengineer.com”, with ports 993 for incoming and 25 for outgoing (both using SSL). I also have SSL setup through LetsEncrypt, which is where the certs point to in the main.cf file below (this file is a bit of a mess from trying to pull from different sources to make this work).

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
myorigin = mmaengineer.com

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
#smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
#smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
#smtpd_use_tls=yes
#smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
#smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_tls_cert_file=/etc/letsencrypt/live/mmaengineer.com/cert.pem
smtpd_tls_key_file=/etc/letsencrypt/live/mmaengineer.com/privkey.pem
smtpd_tls_CAfile=/etc/letsencrypt/live/mmaengineer.com/chain.pem
smtpd_use_tls=yes
smtpd_tls_auth_only = yes

smtpd_tls_loglevel = 1

smtp_use_tls=yes
# Disable SSLv2/3 as they are vulnerable
smtpd_tls_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3
# Insist on stronger ciphers
smtpd_tls_ciphers = high
smtp_tls_ciphers = high
broken_sasl_auth_clients = yes
smtp_tls_cert_file = /etc/letsencrypt/live/mmaengineer.com/cert.pem
smtp_tls_key_file = /etc/letsencrypt/live/mmaengineer.com/privkey.pem


smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = Mmaengineer
alias_maps = hash:/etc/aliases proxy:pgsql:/etc/postfix/pgsql-aliases.cf
local_recipient_maps = proxy:pgsql:/etc/postfix/pgsql-boxes.cf $alias_maps
alias_database = hash:/etc/aliases
mydestination = Mmaengineer, localhost.localdomain, , localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all

mailbox_transport = lmtp:unix:private/dovecot-lmtp
virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf