I don't think there's anything wrong with numbers. If you had a common name like Mary Smith, even your professional email address would be likely to contain numbers...
The first place I worked, email addresses were in the format of firstname.lastname@example.org
. If there was more than one Mary Smith, the second one's email address was email@example.com
. So I doubt that they're going to have a problem with numbers following your name in the email address... unless, of course, your numbers are 69
If they bother you, try another server or use any of the suggestions Meriwhen offered. MSmith may be taken, but you can be marysmith, mary.smith, mary_smith, smithm, smithmary, maryksmith, etc. As long as you're not something like XXMarySmithHotMommaXX69, I doubt that anyone is going to think your name is unprofessional.