As I was following the tutorial (https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-on-ubuntu-18-04)

I established postfix mail server. By the way unfortunately a can’t send e-mails anywhere outside my droplet. According to logs I receive status: status=bounced (host healthqode.me[127.0.1.1] said: 554

Here is the last log data:

sudo tail -f /var/log/mail.log Apr 25 11:15:26 healthqode postfix/submission/smtpd[26048]: connect from localhost.localdomain[127.0.0.1] Apr 25 11:15:26 healthqode postfix/submission/smtpd[26048]: NOQUEUE: reject: RCPT from localhost.localdomain[127.0.0.1]: 554 5.7.1 myrealmail@mail.com: Recipient address rejected: Access denied; from=mymail@healthqode.me to=myrealmail@mail.com proto=ESMTP helo=<healthqode.me> Apr 25 11:15:26 healthqode postfix/smtp[26046]: 93683428F4: to=myrealmail@mail.com, relay=healthqode.me[127.0.1.1]:587, delay=0.13, delays=0.02/0.02/0.09/0.01, dsn=5.7.1, status=bounced (host healthqode.me[127.0.1.1] said: 554 5.7.1 myrealmail@mail.com: Recipient address rejected: Access denied (in reply to RCPT TO command)) Apr 25 11:15:26 healthqode postfix/submission/smtpd[26048]: disconnect from localhost.localdomain[127.0.0.1] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=6/8 Apr 25 11:15:26 healthqode postfix/cleanup[26044]: B27B2428F6: message-id=20220425111526.B27B2428F6@healthqode.me Apr 25 11:15:26 healthqode postfix/qmgr[26037]: B27B2428F6: from=<>, size=2424, nrcpt=1 (queue active) Apr 25 11:15:26 healthqode postfix/bounce[26050]: 93683428F4: sender non-delivery notification: B27B2428F6 Apr 25 11:15:26 healthqode postfix/qmgr[26037]: 93683428F4: removed Apr 25 11:15:26 healthqode postfix/local[26052]: B27B2428F6: to=myrootuser@healthqode.me, orig_to=mymail@healthqode.me, relay=local, delay=0.02, delays=0/0.01/0/0, dsn=2.0.0, status=sent (delivered to maildir) Apr 25 11:15:26 healthqode postfix/qmgr[26037]: B27B2428F6: removed

What I have tried:

1. I have added ports 587, 465 and 25 in ufw firewall allows,

2. Added SPF and MX records. Here is my DNS-settings:

CNAME mail.healthqode.me healthqode.me TXT healthqode.me v=spf1 include:healthqode.me ~all MX healthqode.me healthqode.me 10 A www.healthqode.me 164.92.243.79 A healthqode.me 164.92.243.79 NS healthqode.me ns1.digitalocean.com NS healthqode.me ns2.digitalocean.com NS healthqode.me ns3.digitalocean.com

3. dig -x 164.92.243.79

; <<>> DiG 9.11.3-1ubuntu1.17-Ubuntu <<>> -x 164.92.243.79 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39319 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;79.243.92.164.in-addr.arpa. IN PTR

;; ANSWER SECTION: 79.243.92.164.in-addr.arpa. 1800 IN PTR healthqode.me.

;; Query time: 24 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Mon Apr 25 11:52:22 UTC 2022 ;; MSG SIZE rcvd: 82

By the way when I try to dig a domain it return the further:

dig -x healthqode.me

; <<>> DiG 9.11.3-1ubuntu1.17-Ubuntu <<>> -x healthqode.me ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 8643 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;me.healthqode.in-addr.arpa. IN PTR

;; Query time: 25 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Mon Apr 25 11:52:49 UTC 2022 ;; MSG SIZE rcvd: 55

4. I checked e-mail in blacklists. Everything is ok. By the way mxtoolbox returns everything ok except one line: Reverse DNS is not a valid Hostname

5.Here is my main.cf file content:

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination myhostname = healthqode.me alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = $myhostname, healthqode.me, mail.healthqode.me, localhost.healthqode.me, localhost #relayhost = [mail.healthqode.me]:587 #relayhost = smtp.healthqode.me:submission #relayhost = [healthqode.me]:587 (I tried different varies of this record, nothing changed) relayhost = healthqode.me:submission 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 (I changed this record to ipv4) inet_protocols = ipv4 home_mailbox = Maildir/ virtual_alias_maps = hash:/etc/postfix/virtual

smtp_tls_security_level=encrypt (Added this line)

6. Here is my master.cf

submission inet n - y - - smtpd (uncommented this line) -o syslog_name=postfix/submission (uncommented this line) -o smtpd_tls_security_level=encrypt (uncommented this line) -o smtpd_sasl_auth_enable=yes (uncommented this line) -o smtpd_tls_auth_only=yes (uncommented this line)

-o smtpd_reject_unlisted_recipient=no

-o smtpd_client_restrictions=$mua_client_restrictions

-o smtpd_helo_restrictions=$mua_helo_restrictions

-o smtpd_sender_restrictions=$mua_sender_restrictions

-o smtpd_recipient_restrictions=

-o smtpd_relay_restrictions=permit_sasl_authenticated,reject (uncommented this line) -o milter_macro_daemon_name=ORIGINATING (uncommented this line)

7. I added SSL by sertbot to domains: healthqode.me, www.healthqode.me, mail.healthqode.me

8. I tried to change my hostfile settings so I turned them to the standard settings:

127.0.1.1 healthqode.me 127.0.0.1 localhost.localdomain localhost

The following lines are desirable for IPv6 capable hosts

::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters

Nothing :((((

PS Sometimes trying different settings, I receive said 530. So I tried different ways to solve my problem, but don’t know what to try anymore. I have read a lot of issues on Stack and DO, and nothing that could help me.

PPS the domain name register is GoDaddy, The DNS records there are: NS healthqode.me ns1.digitalocean.com NS healthqode.me ns2.digitalocean.com NS healthqode.me ns3.digitalocean.com