The Travelodge UK hotel chain has issued a warning to users of its online service to watch out for spam e-mails.
"A small number of you may have received a spam e--mail via the e-mail address you have registered with us," said the letter signed by chief executive Guy Parsons.
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According to the letter, no financial information has been compromised, but Travelodge says it is conducting a comprehensive investigation.
The letter contains no information about how the e-mail addresses were obtained, but says Travelodge has not sold user data to a third party.
The letter advises customers to delete any messages that are similar to e-mails some customers have received that offer an "exciting career opening" and "brilliant income ability" at a company seeking "self-motivated people in United Kingdom" to help spread activity in the UK area.
Travelodge says a further update will be given once it has completed its investigation, but gives no indication of when that is likely to be.