I have a VF email template that should get delivered with a .ical attachment. When the email gets delivered, the .ical's first line appears to be a line break. This prevents it from validating correctly at this validator (http://severinghaus.org/projects/icv/), and it also causes issues when trying to open with Outlook, for example. When I edit the attachment and remove the first line break, it validates and opens fine in Outlook.

I don't see where in the VF itself the line break is getting introduced. Can anyone offer some help? For context, when the rendered file gets delivered via email, there is a blank line right before "BEGIN:VCALENDAR" which is causing the issue.

</body>
</messaging:htmlEmailBody>
<messaging:attachment filename="{!RelatedTo.evt__Event__r.Name}.ics" renderAs="text/calendar; charset=UTF-8; method=PUBLISH">
BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
X-WR-TIMEZONE:America/New_York
BEGIN:VEVENT
DTSTAMP:<apex:outputText value="{!SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(TEXT(NOW()),':',''),'-',''),' ','T')}"/>
UID:<apex:outputText value="{!SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(TEXT(RelatedTo.evt__Event__r.evt__Start__c),':',''),'-',''),' ','T')}"/>
ATTENDEE;CN={!RelatedTo.evt__Email__c}
STATUS:CONFIRMED
DTSTART;TZID=America/New_York:<apex:outputText value="{!SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(TEXT(RelatedTo.evt__Event__r.evt__Start__c),':',''),'-',''),' ','T')}"/>
DTEND;TZID=America/New_York:<apex:outputText value="{!SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(TEXT(RelatedTo.evt__Event__r.evt__End__c),':',''),'-',''),' ','T')}"/>
LOCATION:{!RelatedTo.evt__Event__r.evt__Venue_Name__c} - {!RelatedTo.evt__Event__r.evt__Street__c}, {!RelatedTo.evt__Event__r.evt__City__c} {!RelatedTo.evt__Event__r.evt__State__c} {!RelatedTo.evt__Event__r.evt__Postal_Code__c}
ORGANIZER;CN="Lawley Insurance":mailto:lawley@lawleyinsurance.com
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=en-us:{!RelatedTo.evt__Event__r.Name}
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR
</messaging:attachment>

</messaging:emailTemplate>