diff --git a/config.yml.sample b/config.yml.sample
index 542c44137..79bf1370e 100644
--- a/config.yml.sample
+++ b/config.yml.sample
@@ -127,7 +127,8 @@ mailer:
   enabled: false
   # SMTP Host
   host: ""
-  # SMTP Host port
+  # SMTP Host port.
+  # **NOTE:** If you're unable to send mail and the only error you see in the logs is an `EOF`, try setting the port to `25`.
   port: 587
   # SMTP Auth Type. Can be either `plain`, `login` or `cram-md5`.
   authtype: "plain"
diff --git a/docs/content/doc/setup/config.md b/docs/content/doc/setup/config.md
index fc5254d76..16cae3d2a 100644
--- a/docs/content/doc/setup/config.md
+++ b/docs/content/doc/setup/config.md
@@ -657,7 +657,8 @@ Environment path: `VIKUNJA_MAILER_HOST`
 
 ### port
 
-SMTP Host port
+SMTP Host port.
+**NOTE:** If you're unable to send mail and the only error you see in the logs is an `EOF`, try setting the port to `25`.
 
 Default: `587`