[courier-users] Setting Up Mail Server Operation for CentOS Web Panel Web Hosting Control Panel on
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[courier-users] Setting Up Mail Server Operation for CentOS Web Panel Web Hosting Control Panel on Amazon AWS Cloud
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From: Turritopsis D. T. En M. <ce...@te...> - 2020-02-25 15:33:40
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Subject: Setting Up Mail Server Operation for CentOS Web Panel Web Hosting Control Panel on Amazon AWS Cloud Author: Mr. Turritopsis Dohrnii Teo En Ming, Singapore Date: 25 Feb 2020 Tuesday PREREQUISITES ============= Before embarking on this guide, you should read the following guide first. Guide: Mr. Teo En Ming's Guide to Deploying CentOS Web Panel (CWP) Web Hosting Control Panel on Amazon AWS Cloud Redundant blog links: [1] https://tdtemcerts.blogspot.com/2020/02/mr-teo-en-mings-guide-to-deploying.html [2] https://tdtemcerts.wordpress.com/2020/02/23/mr-teo-en-mings-guide-to-deploying-centos-web-panel-cwp-web-hosting-control-panel-on-amazon-aws-cloud/ EXTREMELY DETAILED INSTRUCTIONS OF TEO EN MING'S GUIDE ====================================================== Teo En Ming's DNS Zone File for domain teo-en-ming.com on Primary DNS Server ============================================================================ $TTL 300 @ IN SOA ns1.teo-en-ming.com. ceo.teo-en-ming.com. ( 2020022502 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; ; name servers - NS records IN NS ns1.teo-en-ming.com. IN NS ns2.teo-en-ming.com. ; mail servers - MX records IN MX 0 mail.teo-en-ming.com. ; name servers - A records ns1.teo-en-ming.com. IN A 13.58.253.162 ns2.teo-en-ming.com. IN A 3.20.186.205 ; mail servers - A records mail.teo-en-ming.com. IN A 3.21.30.127 ; Additional A records www.teo-en-ming.com. IN A 3.21.30.127 teo-en-ming.com. IN A 3.21.30.127 ; Sender Policy Framework (SPF) TXT records teo-en-ming.com. IN TXT "v=spf1 ip4:3.21.30.127 -all" ===EOF=== REFERENCE ========= Guide: Mail Exchange Record (MX) Link: https://www.zytrax.com/books/dns/ch8/mx.html REFERENCE ========= Guide: How To: Lowering Your DNS TTLs Link: https://www.liquidweb.com/kb/how-to-lowering-your-dns-ttls/ REFERENCE ========= Discussion: Postfix: “Connection timed out” on all outbound email [closed] Link: https://serverfault.com/questions/585503/postfix-connection-timed-out-on-all-outbound-email QUOTE: "For anyone who found this question but is on AWS EC2: outgoing SMTP intentionally rate limited, but you can ask to have it relaxed." REFERENCE ========= Discussion: Intermittent exim gmail smtp connection timeout Link: https://forums.cpanel.net/threads/intermittent-exim-gmail-smtp-connection-timeout.523911/ QUOTE: "Just an update for anyone with a similar issue - with some fresh eyes and some more googling it sounds like this may be caused by some SMTP rate limitations built into the AWS EC2 network as Spam prevention. They have a form to register to remove outgoing smtp connection limitations here: https://aws.amazon.com/forms/ec2-email-limit-rdns-request I've submitted and will update if this resolves the issues I was seeing." QUOTE: "Amazon SMTP traffic management indeed seems to have been the cause. Within a couple of hours of filling out the above form, I got an email confirmation from AWS that "traffic restrictions had been removed" and normal function resumed immediately. Confusing the matters is that this SMTP traffic management is not documented well (and sometimes with contradicting information). It does not appear to be a hard cap limit, nor does it trigger any notification when it's applied - it actually appears to be a *throttle* on common SMTP ports, triggered by a very small number of connections, beyond which it allows a certain number of connections per/hour - which would absolutely create the kind of "intermittent" connectivity issues I saw (and the odd delivery order of mail in the queue depending on when a retry "won the lottery" to negotiate a connection). Anyway - I hope that info is of some use to others in the future!" REFERENCE ========= Guide: Installing Telnet In CentOS/RHEL/Scientific Linux 6 & 7 Link: https://www.unixmen.com/installing-telnet-centosrhelscientific-linux-6-7/ Amazon Web Services' Reply to Teo En Ming ========================================= Hello, We approved your request for the removal of the EC2 email sending limitations on your Amazon Web Services account! If you requested removal of email sending limits on any other Amazon Elastic IPs, they've also been removed. Because reverse DNS record entries are commonly considered in anti-spam filters, we recommend assigning a reverse DNS record to the Elastic IP address you use to send email to third parties. Please use the form located at this link to request a reverse DNS entry: https://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/ec2-email-limit-rdns-request If you'd like to proceed with assigning a reverse DNS record to the Elastic IP, the first step would be to configure the A record for the domain to match the desired PTR record on your side. Please follow the instructions at the link below to create the A record: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-creating.html Please let us know if you have any questions. Regards, Amazon Web Services REFERENCE ========= Guide: How to create an SPF TXT record? Link: https://www.dmarcanalyzer.com/spf/how-to-create-an-spf-txt-record/ REFERENCE ========= Guide: Linux BIND DNS Configure Sender Policy Framework ( SPF ) an e-mail Anti Forgery System Link: https://www.cyberciti.biz/faq/howto-bind-djbdns-spf-antispam-dns-configuration/ Creating New User Account in CentOS Web Panel ============================================= Login to CentOS Web Panel Admin Panel. >From the left menu, click on User Accounts, then select New Account. Domain name: teo-en-ming.com Username: Password: Admin Email: Server IPs: Package: Default Reseller: Not checked Inode: 0 Process limit: 40 Open files: 150 Backup user account: checked Shell Access: Disabled by default for security reasons: Unchecked AutoSSL: Domain must be pointed to the server: Unchecked Click Create. Setting Up New Email Account ============================ Login to CentOS Web Panel User Panel. >From the left menu, click Email Accounts, then click Email Accounts. Click Add a New MailBox. Email Address: ce...@te... Password: Quota MB: 16000 Click Add. Using Your New Email Account ============================ Login to Roundcube Webmail. Click Settings. >From the left menu, click Identities, then click ce...@te... Display Name: Turritopsis Dohrnii Teo En Ming Click Save. Congratulations! You can now start using your new email account. -----BEGIN EMAIL SIGNATURE----- The Gospel for all Targeted Individuals (TIs): [The New York Times] Microwave Weapons Are Prime Suspect in Ills of U.S. Embassy Workers Link: https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html ******************************************************************************************** Singaporean Mr. Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 14 Feb 2019 and refugee seeking attempts at the United Nations Refugee Agency Bangkok (21 Mar 2017), in Taiwan (5 Aug 2019) and Australia (25 Dec 2019 to 9 Jan 2020): [1] https://tdtemcerts.wordpress.com/ [2] https://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming -----END EMAIL SIGNATURE----- |
