This is - after all - just a meeting place of domino folks. Not a formal support forum staffed by IBM.
Just trying to set your expectations here…
But - after reading your query - why not create person documents with “nice” names such as “Mobile - Fred Bloggs”, and set the internet address to the “fredsMobileNumber@anExtremelyLogMailAddress”.
Then you could also collate them into Notes groups such as: ‘LetsSendThisToEveryoneWithPhones’
—* Bill “The use of ‘Urgent’ in a subject line might indicate your level of pain, not my level of response” Buchan →
Subject: Urgent: How to convert a smtp address to another (e.g. @sms → @sms.some.weird.long.url.com)
You only have to create a new foreign SMTP Domain document in your Domino Directory.
In the Field: “Internet Domain” enter SMS and in the Field: Internet Host (Should be routed to): the Relay Server name.
You have to enter a Internet Host Name. If you type in the Domain Name who Mails addresses to SMS should be routed will not work. Only the Internet Host Name will give you the result you searching for.