Can't connect to SMTP Server

Since upgrading to OS X Yosemite 10.10.3 I am no longer able to send email via my SMTP server. The SMTP server is the AWS SES service http://aws.amazon.com/ses/ and the smtp server name is email-smtp.eu-west-1.amazonaws.com.
Apple Mail refuses to connect to the SMTP server. I have previously managed to resolve this issue by following the instructions described at part 2 of http://osxdaily.com/2014/10/28/fix-mail-smtp-sending-errors-os-x-mac/.
However since upgrading to OS X Yosemite 10.10.3, if I modify the Accounts.plist file as described, Apple Mail just overwrites my changes as soon as I open it.
I am certain that my SMTP credentials are correct as I was able to successfully connect to the SMTP server using these credentials prior to upgrading to version 10.10.3 of OS X Yosemite.
As things stand I am unable to send any email via this SMTP server.
Any help would be very much appreciated.
Matthew

Try this:
Menu "Mail", select Preference
Click on Accounts
Near the bottom, click on the button "Server Settings"
See if the check box for SSL is checked; if it is, try un-checking it, then close everything and try mail again.
Explanation: When I'm at work, and use my Mail app as an IMAP account, I need to have SSL checked as we use SSL inside the building. When I travel, and use a hotel internet connection, some hotel ISPs won't allow SSL, so I have to un-check it to send email.
Hope this helps...
beadman

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