We have a Django webapp running on an Amazon EC2 instance. We're using the Django `django.core.mail.send_mail()` function to send emails out. This doesn't work for Gmail accounts, but it is working for other accounts -- in particular, my college account, which is run through Gmail, receives the message with no problems. Checking `/var/log/syslog` shows this:

```
Jun 22 19:50:43 apatapa postfix/smtp[7625]: 4D80524B4F: to=<NAME@gmail.com>, relay=none, delay=120, delays=0.02/0.01/120/0, dsn=4.4.1, status=deferred (connect to alt3.gmail-smtp-in.l.google.com[173.194.70.26]:25: Connection timed out)

```

Sending to a college account:

```
Jun 22 19:54:49 apatapa postfix/smtp[7658]: 0570A24B57: to=<NAME@COLLEGE.edu>, relay=COLLEGE.edu.s10a1.psmtp.com[74.125.244.10]:25, delay=2.4, delays=0.02/0.01/0.36/2, dsn=2.0.0, status=sent (250 Thanks)

```

Just to be sure, I used `traceroute`, and an email sent to the college account is actually going through Gmail's servers.

Any ideas on what might cause this?