Quote

"The security and control of registration and voting materials require special attention for external voting. Security is as essential externally as it is internally but there is the added challenge of securing sensitive materials during transport to and from several countries."

Document

International IDEA: Voting From Abroad: The International IDEA Handbook, p. 122

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Voting From Abroad: The International IDEA Handbook

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Summaries

Residency requirements should not be excessive, or may be considered discriminatory.
Accommodation to vote should be made for voters with special needs, including eligible voters currently out of the country.
Methods to facilitate voting may include voting abroad.