Default DMARC entries are not syntactically correct

[kienanstewart]

In AlternC 3.5.0rc1, the default DMARC entries are set to

p=none;pct=100;rua=%%ADMINMAIL%%;aspf=r;adkim=r

The rest of the DMARC entry, v=dmarc1 is added in m_mail::set_dns_dmarc

There are two problems with the created records:

1. The value of the v tag is case senstive and must be DMARC1 instead of dmarc1
2. The value of rua should have mailto: before the e-mail address

(https://tools.ietf.org/html/rfc7489

A correct (complete) entry might look like

v=DMARC1;p=none;pct=100;rua=mailto:%%ADMINMAIL%%;aspf=r;adkim=r

thanks,
Kienan

[kienanstewart]

PR #442

[vincib]

This bug will need a php script to fix the existing values in alternc upgraded from 3.x or 3.5~rc

I propose the following way to do it :

• change the global variable value if it's the stock one, don't change it if it has been changed by the admin
• change all sub_domains entries that contains a rua=address by rua=mailto:address,