Azure Linux VM - sending mail using postfix or other

Question

Azure Linux VM - sending mail using postfix or other

mmac 71

Trying to send email out to our internal users only from an Azure VM (Linux CentOS7), we have basic Azure tenant. Pay as you go servers.

Linux server is bound and getting usernames\groups from Azure Domain Services server.
I monitor various aspects and need to have emails sent out from the Linux server to our Office365 users (email)
I have our MX record and port 25 for our Exchange online email server details

Would like - use postfix on Linux server to send to our Exchange server and internal domain users only
What is best way to accomplish this? I read sendgrid would work as a 'smarthost', I would prefer to go directly from Linux server to Exchange (online)

I read Microsoft blocks port 25 by default and you have to request? We do not have a support subscription, is one needed to make this request?

Thank you!

JimmyYang-MSFT 58,561 Reputation points Microsoft External Staff

2022-07-17T13:35:00.05+00:00

Hi @mmac

Teams linux tag is mainly focused on the general issue of Microsoft Teams for Linux troubleshooting. According to your description, your question is not in our support scope. So I will remove teams-linux tag from your thread. Thanks for your understanding!
KapilAnanth-MSFT 49,301 Reputation points Microsoft Employee

2022-07-19T10:30:26.277+00:00

Hi @mmac ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to send mail from Azure VM, i.e, enable port 25.

As stated by @Dillon Silzer , only Enterprise Agreement subscriptions will have port 25 enabled.

We recommend you adhere to the suggested best practice, an authenticated SMTP relay service.
https://learn.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity

Thanks,
Kapil.

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Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided in the Answer section helps you, as this can be beneficial to other community members.
Rajesh Swarnkar 891 Reputation points

2023-03-01T03:52:10.49+00:00

Is there custom data script to achieve SMTP server on Ubuntu Azure VM? I mean nothing fancy. Just for sake of dev/test.

3 answers

Your answer

JimmyYang-MSFT 58,561 Reputation points Microsoft External Staff

2022-07-17T13:35:00.05+00:00

Hi @mmac

Teams linux tag is mainly focused on the general issue of Microsoft Teams for Linux troubleshooting. According to your description, your question is not in our support scope. So I will remove teams-linux tag from your thread. Thanks for your understanding!
KapilAnanth-MSFT 49,301 Reputation points Microsoft Employee

2022-07-19T10:30:26.277+00:00

Hi @mmac ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to send mail from Azure VM, i.e, enable port 25.

As stated by @Dillon Silzer , only Enterprise Agreement subscriptions will have port 25 enabled.

We recommend you adhere to the suggested best practice, an authenticated SMTP relay service.
https://learn.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity

Thanks,
Kapil.

----------------------------------------------------------------------------------------------------------------

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided in the Answer section helps you, as this can be beneficial to other community members.
Rajesh Swarnkar 891 Reputation points

2023-03-01T03:52:10.49+00:00

Is there custom data script to achieve SMTP server on Ubuntu Azure VM? I mean nothing fancy. Just for sake of dev/test.

Answer 1

Hello @MikeMacNeil-5031

It is recommended that you use authenticated SMTP (port 587) to sendmail from an Azure VM (SendGrid is one of the recommendations they make to use). If you have an enterprise subscription then you will have access to raising a ticket with Microsoft as seen in the document below.

For more information please read the documentation on https://learn.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity

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If this helps please mark as correct answer.

Answer 2

Postfix can be set up to send authenticated SMTP, eg in /etc/postfix/main.cf

smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:USERNAME:PASSWORD
smtp_sasl_security_options = noanonymous
smtp_tls_security_level = encrypt

relayhost = [198.51.100.10]:587

You can use an IP address or hostname within the square brackets.
Make sure that your ufw and Azure outbound port rules allow the connection - which they may do by default

See here:

Answer 3

mmac 71

Thank you, yes I read all of that and referrenced some of it in my question. Looking to see if anyone has something more creative or a better answer.

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Azure Linux VM - sending mail using postfix or other

3 answers

Your answer