block port 25 for sending outgoing email to other mail server in digital ocean วันนี้เจอเคสของลูกค้าที่ขอใช้งานที่ DO (Digital Ocean) ครับ
เวลาถ้าจะส่งเมลออกไปยัง Mail server ที่อื่น จะต้องขออนุญาตจาก ทาง DO ก่อนครับ
เนื่องจากเป็นข้อกำหนดของทาง Cloud เขา
เพราะค่าปกติจะไม่สามารถส่งเมลออกไปด้านนอกได้
# telnet 103.246.17.abc 25
Trying 103.246.17.abc ...
telnet: connect to address 103.246.17.abc: Connection timed out
ทำการเปิด ticket ในระบบ DO
My droplet IP (128.199.22.xy) could not telnet to port 25 ( on external server).
# telnet 103.246.17.abc 25
Trying 103.246.17.abc...
telnet: connect to address 103.246.17.abc: Connection timed out
# telnet 103.246.17.abc 25
Trying 103.246.17.abc...
อีกรอบเขาจะให้ confirm และแจ้งข้อมูลตามข้อที่ถามมา ก็ตอบกลับไปให้เขาครับ แล้วรอสัก 1-2 วัน
1. Your name.
=> Kijtanat Pornsommai
2. What business or individual you are going to send mail on behalf of as well as their website (if one exists).
=> Business related with booking system for hotel reservation.
3. What kind of mail you're going to be sending (password resets, newsletters, marketing mail, transactional mail such as order confirmations)
=> Newsletters and order confirmations email.
4. If you're sending on behalf of a business or an individual that is not yourself, what is your relationship to that business or individual. Also, as we are a US based company, I'd like to make sure you understand that we require all users of our network to follow both the requirements of the CAN-SPAM (
https://www.ftc.gov/tips-advice/business-center/guidance/can-spam-act-compliance-guide-business )act in regards to any non-transactional mail sent to any subscriber anywhere in the world, as well as the CASL (
http://fightspam.gc.ca/eic/site/030.nsf/eng/home ) for any email you send to any subscribers in Canada. Additionally, there are additional restrictions to sending email to users in Europe created by both the EU itself and its member countries, and would recommend that you investigate and follow all relevant guidelines for the countries of any European subscribers you may have. Please let us know Trust & Safety DigitalOcean ref:_00Do0IjOV._5001NU6TjP:ref
=> Email from this server sent out under @1hotelsolution.com email and noted to your concern.
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