PostFix: Reason:530 5.5.1 Authentication Required

I am trying to setup PostFix to be my local SMTP replay for all my services to send alerts to myself.

However, I am not able to authenticate with the Zoho SMTP service to send messages.

The log says the following:

Sep 22 13:15:29 core postfix/qmgr[168993]: 563E13FEC9: from=<root@core.HOST>, size=374, nrcpt=1 (queue active)

Sep 22 13:15:29 core postfix/smtp[169236]: host smtp.zeptomail.com[165.173.183.10] offers SMTPUTF8 support, but not 8BITMIME
Sep 22 13:15:30 core postfix/smtp[169236]: host smtp.zeptomail.com[165.173.183.10] offers SMTPUTF8 support, but not 8BITMIME
Sep 22 13:15:30 core postfix/smtp[169236]: 563E13FEC9: to=<1PHONE####@tmomail.net>, relay=smtp.zeptomail.com[165.173.183.10]:587, delay=0.91, delays=0.04/0/0.77/0.1, dsn=5.5.1, status=bounced (host smtp.
zeptomail.com[165.173.183.10] said: 530 5.5.1 Authentication Required. (in reply to MAIL FROM command))
Sep 22 13:15:30 core postfix/cleanup[169234]: 599173FED9: message-id=<20230922171530.599173FED9@core.HOST>
Sep 22 13:15:30 core postfix/bounce[169237]: 563E13FEC9: sender non-delivery notification: 599173FED9

Thank you for the help!

New to Zoho CRM Plus?

Deliver unforgettable customer experiences

ACCESS ZOHO CRM PLUS

New to Zoho CRM Plus?

Deliver unforgettable customer experiences

ACCESS ZOHO CRM PLUS

New to Zoho Marketing Plus?

Everything you need to run your marketing

ACCESS ZOHO MARKETING PLUS

New to Zoho Marketing Plus?

Everything you need to run your marketing

ACCESS ZOHO MARKETING PLUS

Tout forum

France ZUGs

Zoho SalesIQ Resources

Topic Participants
Phillip Ferland
Prakash C

Sticky Posts
TransMail Overview
Note: TransMail is now ZeptoMail. Click here to know more. Hey there! It's been 5 months since we launched Zoho's transactional email service — TransMail. We've had great response and onboarded many users. I'd like to now give an overview of TransMail
TransMail has a new name—ZeptoMail!
Tried navigating to TransMail's community forum but see a different name now? That's because TransMail has a new name. TransMail is now ZeptoMail! As we’ve grown from an internal service used mainly by other Zoho products to an up-and-coming competitor
Welcome to TransMail community
Note: TransMail is now ZeptoMail. Click here to know more. Hi everyone, Welcome to TransMail's community forum. Though TransMail has been in use inside Zoho for nearly half a decade, we only recently launched it as a service to all of you. We'd firstly