Question

Can't send email from Droplet to same domain using Sendmail.

I’ve set up two LAMP Droplets with sendmail. One server is sending to the same domain that’s pointing to itself with no problem, however the other one will not send to the same domain as itself.

It’s giving an error of:

050 503-All RCPT commands were rejected with this error:
050 503-unknown user

I’ve set both droplets up in accordance to this guide using the droplet’s respective domains.

Is there something I’ve missed or is there an alternative?

mod edit: fixed the link

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Kamal Nasser • April 21, 2016

Hi!

It looks like Steve had the same issue, and so he included a solution under ATTENTION! READ THIS…. I’ll copy them here:

  1. Edit /etc/mail/sendmail.mc and add the following lines at the end:

    define(`MAIL_HUB', `domain.com.')dnl
define(`LOCAL_RELAY', `domain.com.')dnl

    Make sure you including the trailing dot!

  2. Run sendmailconfig so that the changes take effect, and restart sendmail just to be 100% sure:

    sudo sendmailconfig  
sudo service sendmail restart

Once you’ve done that, try sending an email to the same domain and you should see sendmail connecting to your domain’s incoming mailserver(s) in the log file.

Leandro Andrade Candido • August 5, 2016

I made this changes… But… not working for emails(same domains - another domains works)… Using external mx.

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up