SSL library is optional, not a fatal error

Some ends too much.

Some changes to report more correct SASL failures. Support for disabled accounts.

Merging with main branch.

Checking some variables for nil so no errors occur that'll break the server.

Removing some debug messages.

Merge from waqas

Added temporary fix for srv on windows: using opendns nameservers

Check to prevent error on IQs from completely unhandled origins

Backed out the backout. Now we're back out.

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