My website successfully connects to Brevo and establishes TLS encryption, but authentication fails with the following error:
525 5.7.1 Unauthorized IP address
Other Information
I am hosting my website, sanssa.page.gd, on InfinityFree, and I am trying to configure email delivery for my PHP application using Brevo SMTP.
My SMTP configuration is:
SMTP Host: smtp-relay.brevo.com
SMTP Port: 587
Encryption: STARTTLS
Could you please help me with the following?
Confirm the outgoing public IP address used by my hosting account when connecting to external SMTP services.
Confirm whether this outgoing IP address is shared, static, or dynamic.
Advise whether my hosting account permits outgoing SMTP connections to external email providers such as Brevo.
Explain whether there are any hosting restrictions that could cause this authentication error.
I need this information to determine whether I can authorize the correct IP address in my Brevo account.
Thank you for your assistance.
Welcome to the InfinityFree community forum! Good to have you here.
Most people answering here are volunteers. They’re often the fastest source of help. Admin (the only staff member) checks in about once a day for issues on our end.
Volunteers can’t see your account or website. Share what you actually see, like error messages and what happens when you try something. That’s more useful than your theory of what’s wrong.
AI tools often get InfinityFree wrong. If a volunteer’s advice differs from what an AI told you, please try the volunteer’s suggestion first.
Solving an issue is a joint effort. Try the suggestions you get and report back what happened.
Beep boop, I’m a bot! I dug through the forum to get you started. I sometimes get things wrong though, so do with this what you will until a human has a look.
I couldn’t find anything that confirms the outgoing IP address for your account, or whether it’s shared, static or dynamic. I can’t give you an address to authorize in Brevo. That part needs a person to look.
On your SMTP question, our article on sending email says InfinityFree doesn’t restrict sending email through external providers, and that includes SMTP. The restriction is on PHP’s mail() function, not on SMTP to outside services:
Your connection and the TLS handshake worked, and the 525 reply came back after that. That suggests Brevo is the one rejecting the login because the connecting IP isn’t on your allowed list. I can’t tell from the article whether anything on our side affects that.
Thank you for your response.
I understand that the connection and TLS handshake are successful, but Brevo rejects the authentication with 525 5.7.1 Unauthorized IP address.
Could a human support team member please help me determine the outgoing public IP address used by my hosting account when connecting to external SMTP services?
I need to know whether this IP address is shared or dynamic so I can determine whether it can be authorized in Brevo.
My website is sanssa.page.gd.
Thank you.