1) My hosting provider is using CentOS 5 with perl 5 8 8 In order to make it work with Dadamail v8 I had to change the top of every cgi script (uncompress, install, mail, view_logs, etc) from #!/usr/bin/perl to #!/usr/local/cpanel/3rdparty/bin/perl

If you're running Dada Mail under CGI, here are the only files you will need to adjust:

dada/installer/install
cgi
dada/installer/templates/mail
cgi
tmpl
(perhaps any of the extensions you are using) 

No need to change any of the plugins

If the installer could provide an option to rewrite the first line in all the perl scripts, that would save me a bunch of hassle

I think it's a great idea, but there's a Catch 22 - how do you modify the script to point to another Perl, using the script that needs to be modified? There's probably a better way to do this, probably with using an environmental variable

2) The curl cron command requires '-A "Mozilla/4 0"' to work properly

curl -A "Mozilla/4 0" -s --get --url http://$URL/cgi-bin/dada/mail cgi/…

The curl command I provide is just used as an example (and is labeled as such) - it's true that you may need to modify it for your own use But, I utilize the curl command unmodified in the majority of my installations Putting this as an example of a, "this may be needed because X" wouldn't be a bad addition to the doc (http://dadamailproject com/d/features-scheduled_cronjobs pod html) - what's the reasoning?

Is there something in the way Dadamail uses sendmail that could explain this behavior? Could the use of the cpanel perl somehow have contributed to this?

Without any error logs, I'm not really sure

Also when enabling "Automatically set batching speed" option I get the message "Warning! There is a problem with your credentials" even though everything works Well done getting SES integrated so smoothly into Dadamail

Ditto

Let me know if you require more details or if you would like me to create Github issues

Opening up issues (and patches!) are always welcome,