send alert via exchange server

[Fran]

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Good morning,

If you want to use postfix as a relay for sending via an Exchange account you must take into account that Exchange requires TLS encryption. In addition to using a version from 2.9.0 onwards once these checks are done:

You need to know the default SMTP port configuration:

Port 587 with TLS encryption

# To use all our network interfaces

inet_interfaces = all

# We indicate our server, information that we have collected from the Exchange Online web site

relayhost = [xxxxxxxxxxx.outlook.com]:587

# In the following parameters we say that the server needs authentication and the location of the file with the security credentials

smtp_sasl_auth_enable = yes

smtp_sasl_password_maps = hash:/etc/postfix/sasl/passwd

# We say that we do not accept anonymous connections

smtp_sasl_security_options = noanonymous

# When using TLS encryption we need to indicate where we have our certificate located

smtp_tls_CAfile = /etc/postfix/cacert.pem

# We indicate that we are indeed going to use TLS as encryption system

smtp_use_tls = yes

# Let us know which is our domain

relay_domain = domain.com

# We also say that when connecting to the server always send an ehlo

smtp_always_send_ehlo = yes

# Here comes an important part, we have to use a generic file, where we will indicate the aliases we are going to use for the sending

smtp_generics_maps = hash:/etc/postfix/generic

We need to generate the security certificate, we will use the cat command, which will send the output from one text file to another, as follows:

cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem > /etc/postfix/cacert.pem

you should place it in a different path always indicating it in the main.cf. For example:

nano /etc/postfix/sasl/passwd

We indicate permissions to the file so that only the root user can see it:

chmod 600 /etc/postfix/sasl/passwd

Now we use the postmap command, to make the file readable by the Postfix system:

postmap /etc/postfix/sasl/passwd

Creation of the generic file.

First of all, we tell the system that we want to create new aliases:

newaliases

Now we create the file:

nano /etc/postfix/generic

And edit it:

[System superuser] [Our Office365 account].

root@localdomain [email protected]

Exit the editor and generate a readable file:

postmap /etc/postfix/generic

Now that we have all the files generated, we can restart the server:

/etc/init.d/postfix restart

[Fran]

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you can find more information at:

https://pandorafms.com/manual/en/quickguides/configuration_emails_alerts#postfix_configuration

[mejda.abida]

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hello,

thank you very very much 🙂

it’s working now 🙂