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updated exim section for long line support

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IMTheNachoMan
2019-03-05 21:15:08 -05:00
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@@ -2254,9 +2254,12 @@ You can use any Gmail account. I recommend you create one specific for this serv
There are many guides on-line that cover how to configure Gmail as MTA using STARTTLS including a [previous version of this guide](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/tree/cc5edcae1cf846dd250e76b121e721d836481d2f#configure-gmail-as-mta). With STARTTLS, an initial **unencrypted** connection is made and then upgraded to an encrypted TLS or SSL connection. Instead, with the approach outlined below, an encrypted TLS connection is made from the start. There are many guides on-line that cover how to configure Gmail as MTA using STARTTLS including a [previous version of this guide](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/tree/cc5edcae1cf846dd250e76b121e721d836481d2f#configure-gmail-as-mta). With STARTTLS, an initial **unencrypted** connection is made and then upgraded to an encrypted TLS or SSL connection. Instead, with the approach outlined below, an encrypted TLS connection is made from the start.
Also, as discussed in [issue #29](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/issues/29) and [here](https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender), exim4 will fail for messages with long lines. We'll fix this in this section too.
#### Goals #### Goals
- `mail` configured to send e-mails from your server using [Gmail](https://mail.google.com/) - `mail` configured to send e-mails from your server using [Gmail](https://mail.google.com/)
- long line support for exim4
#### References #### References
- Thanks to [remyabel](https://github.com/remyabel) for figuring out how to get this to work with TLS as documented in [issue #24](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/issues/24) and [pull request #26](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/pull/26). - Thanks to [remyabel](https://github.com/remyabel) for figuring out how to get this to work with TLS as documented in [issue #24](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/issues/24) and [pull request #26](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/pull/26).
@@ -2265,6 +2268,7 @@ There are many guides on-line that cover how to configure Gmail as MTA using STA
- https://www.exim.org/exim-html-current/doc/html/spec_html/ch-encrypted_smtp_connections_using_tlsssl.html - https://www.exim.org/exim-html-current/doc/html/spec_html/ch-encrypted_smtp_connections_using_tlsssl.html
- https://php.quicoto.com/setup-exim4-to-use-gmail-in-ubuntu/ - https://php.quicoto.com/setup-exim4-to-use-gmail-in-ubuntu/
- https://www.fastmail.com/help/technical/ssltlsstarttls.html - https://www.fastmail.com/help/technical/ssltlsstarttls.html
- exim4 fails for messages with long lines - [issue #29](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/issues/29) and https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender
#### Steps #### Steps
@@ -2357,13 +2361,14 @@ There are many guides on-line that cover how to configure Gmail as MTA using STA
> support in your mail transfer agent. > support in your mail transfer agent.
> ``` > ```
1. Instruct exim4 to use TLS and port 465 by creating the file `/etc/exim4/exim4.conf.localmacros` and adding: 1. Instruct exim4 to use TLS and port 465, and [fix exim's long line issue](https://github.com/imthenachoman/How-To-Secure-A-Linux-Server/issues/29), by creating the file `/etc/exim4/exim4.conf.localmacros` and adding:
``` ```
MAIN_TLS_ENABLE = 1 MAIN_TLS_ENABLE = 1
REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS = * REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS = *
TLS_ON_CONNECT_PORTS = 465 TLS_ON_CONNECT_PORTS = 465
REQUIRE_PROTOCOL = smtps REQUIRE_PROTOCOL = smtps
IGNORE_SMTP_LINE_LENGTH_LIMIT = true
``` ```
[For the lazy](#editing-configuration-files---for-the-lazy): [For the lazy](#editing-configuration-files---for-the-lazy):
@@ -2427,6 +2432,8 @@ There are many guides on-line that cover how to configure Gmail as MTA using STA
``` bash ``` bash
sudo sed -i -r -e "/\.ifdef MAIN_TLS_ENABLE/ a # added by $(whoami) on $(date +"%Y-%m-%d @ %H:%M:%S")\n.ifdef TLS_ON_CONNECT_PORTS\n tls_on_connect_ports = TLS_ON_CONNECT_PORTS\n.endif\n# end add" /etc/exim4/exim4.conf.template sudo sed -i -r -e "/\.ifdef MAIN_TLS_ENABLE/ a # added by $(whoami) on $(date +"%Y-%m-%d @ %H:%M:%S")\n.ifdef TLS_ON_CONNECT_PORTS\n tls_on_connect_ports = TLS_ON_CONNECT_PORTS\n.endif\n# end add" /etc/exim4/exim4.conf.template
``` ```
1. Add the below to `/etc/exim4/exim4.conf.template` after the `.ifdef REMOTE_SMTP_SMARTHOST_HOSTS_REQUIRE_TLS ... .endif` block:
1. Update exim4 configuration to use TLS and then restart the service: 1. Update exim4 configuration to use TLS and then restart the service: