com.atlassian.jira.mail
Interfaces 
IssueMailQueueItemFactory
JiraMailPluginsHelper
MailThreadManager
SubscriptionMailQueueItemFactory
TemplateContextFactory
TemplateIssueFactory
Classes 
DefaultIssueMailQueueItemFactory
DefaultSubscriptionMailQueueItemFactory
DefaultTemplateContextFactory
DefaultTemplateIssueFactory
DummyUser
Email
EmailSubject
IssueMailQueueItem
JiraMailPluginsHelperImpl
JiraMailQueueUtils
JiraMailThreader
MailingListCompiler
MailThreadManagerImpl
StringUtilsBean
SubscriptionMailQueueItem
SubscriptionMailQueueMockRequest
TemplateContext
TemplateIssue
UserMailQueueItem