[exim] ISP blocks ports 25 and 465

Hola, mi ISP bloquea los puertos 25 y 465. Entonces quisiera saber si puedo
usar otro puerto que yo configure.

server:~# tcptraceroute gmail-smtp-in.l.google.com 25
traceroute to gmail-smtp-in.l.google.com (74.125.47.27), 30 hops max, 40
byte pa
ckets
1 192.168.1.1 (192.168.1.1) 0.794 ms 0.908 ms 1.053 ms
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
server:~# tcptraceroute gmail-smtp-in.l.google.com 465
traceroute to gmail-smtp-in.l.google.com (74.125.47.27), 30 hops max, 40
byte pa
ckets
1 192.168.1.1 (192.168.1.1) 0.552 ms 0.723 ms 0.834 ms
2 host14.200-3-60.telecom.net.ar (200.3.60.14) 15.146 ms 19.731 ms
25.059 m
s
3 host129.200-117-79.telecom.net.ar (200.117.79.129) 35.144 ms 39.522
ms 44
.425 ms
4 host69.190-227-246.telecom.net.ar (190.227.246.69) 51.827 ms 59.639
ms 59
.796 ms
5 host114.190-224-165.telecom.net.ar (190.224.165.114) 66.555 ms 73.076
ms
76.980 ms
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
server:~#

GRACIAS.