using a tutanota email to do all the work of setting up my own email server?
I was in the process of setting up an email server for myself (or, at least, trying to) when I wound up accomplishing it in a way that seems far, far too easy; I'm hoping someone here can tell me whether I've left myself open to security problems.
0) I have a tutanota premium email account
1) I registered a domain; for the sake of this post, call it DOMAIN.COM
2) I created a digitalocean webserver running Ubuntu 12.04LTS
3) I transferred the DNS for DOMAIN.COM to the digitalocean servers
4) I edited the DNS settings in digitalocean to create a domain called DOMAIN.COM with the following features:
A) Record type "A", record name "@", record IP = my digitalocean server IP
B) Record type "MX", record name "mail.tutanota.de.", priority = 1
C) Record type "TXT", record name "@", record text = "v=spf1 include:spf.tutanota.de -all"
5) I went into my tutanota email account, added DOMAIN.COM as a domain, and created an alias at that domain ("JDALMAS@DOMAIN.COM").
I can now receive emails that are sent to JDALMAS@DOMAIN.COM.
There is nothing else installed on the digitalocean server, there are not other settings (other than removing root login, and using SSH to login), no security, no nothing. So, as someone who doesn't really know what he's doing with this, what I'd like to know is whether this is safe. Is there a way for someone to hijack/mess with any part of this if I leave it set as is?