Similar to store(), but set contains unique identifiers.
true if server advertises STARTTLS. You cannot get valid value before opening SMTP session.
true if this object uses STARTTLS.
true if this object uses STARTTLS when server advertises STARTTLS.
Enables SMTP/TLS (STARTTLS) for this object. context is a OpenSSL::SSL::SSLContext object.
Disables SMTP/TLS (STARTTLS) for this object. Must be called before the connection is established to have any effect.
see Enumerator#with_index.
@return the XMLDecl standalone value of this document as a String. If no XMLDecl has been set, returns the default setting.
Inserts an child before another child @param child1 this is either an xpath or an Element. If an Element, child2 will be inserted before child1 in the child list of the parent. If an xpath, child2 will be inserted before the first child to match the xpath. @param child2 the child to insert @return the parent (self)