# Mail Delivery Problem
**URL:** https://forum.mautic.org/t/mail-delivery-problem/18567
**Category:** Product Support
**Created:** [March 13, 2021, 5:36pm UTC](https://forum.mautic.org/t/mail-delivery-problem/18567 "2021-03-13T17:36:41Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@pehcastro](https://forum.mautic.org/u/pehcastro)
#### Post date: [March 13, 2021, 5:36pm UTC](https://forum.mautic.org/t/mail-delivery-problem/18567/1 "2021-03-13T17:36:41Z")
**Your software**
My Mautic version is: v3.3.1
My PHP version is: PHP Version 7.4.16 / nginx + apache
My Database type and version is: mariadb / mysqlnd 7.4.16
**Your problem**
My problem is:
The first time I installed Mautic on my server and tested the sending of emails in the configuration panel, I received a test message.
I needed to change this email (because it was my personal) to a sending email, I configured the smtp again and the connection was “successful”, when I try to send the test mail I get an error.
" Expected response code 354 but got code “503”, with message "503-All RCPT commands were rejected with this error: 503-Sender verify failed 503 Valid RCPT command must precede DATA "
Steps I have tried to fix the problem:
I did a full update in my server side (i’m using centos 7 + vestacp) and everything is fine and working, i got all smtp testes in “OK” and actually I’m using those e-mails boxes in my Outlook without problems.
Already **checked the logs** in var/logs and got this (from last night + today error)
> **[\[2021-03-12 23:56:07\] mautic.ERROR: \[MAIL ERROR\] Expected response code 354...](https://pastebin.com/Zjxxs1Wg)**
>
> Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.
All my side configs and SPF, DKIM, DMARC etc on dns are fine, mautic server is on sameip as mail server and I don’t have any issues sending or receiving mail in outlook or gmail (as a mailbox reader/sender using imap/smtp).
So, I checked some [mail+bounce@domain.com](mailto:mail+bounce@domain.com) in log, this is sending by mautic for anthentication, this is right? maybe the problem can be here.
Hope someone can help me solve this out, really love the power of Mautic.
---
### Author:  [@pehcastro](https://forum.mautic.org/u/pehcastro)
#### Post date: [March 13, 2021, 6:01pm UTC](https://forum.mautic.org/t/mail-delivery-problem/18567/2 "2021-03-13T18:01:08Z")
For people getting this error too, my solution is that my server doesn’t allow tracking inboxes with bounce.
So, by removing the monitored inbox settings i did in my mautic panel the problem is gone.
if anyone needs to read more about; [Bounce management | Mautic Community Documentation](https://docs.mautic.org/en/channels/emails/bounce-management)
See ya.