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I have a service that delivers updates to users through various carriers SMTP APIs, for example for Sprint we e-mail 1123456789@messaging.sprintpcs.com and then the owner of the number 1123456789 receives an SMS message which is displayed as being from our e-mail address, for example updates@example.com, the user is then able to reply to this and we receive over SMTP their response.
However, when it comes to AT&T when the user receives our messages, the from address is some number such as 180000001, which increments for each message. As you can imagine, if we send the user 100 updates throughout the week, that is 100 different senders AT&T users see in their phone, which really clogs up their messaging lists.
Is there a way to specify to AT&T a correct from address to display? All of the information I could find from AT&T is here.(I've tested this on Sprint, MetroPCS and T-Mobile and they handle it properly)
Also, with AT&T if the user replies to any of the messages that appears in their phone, even though they have 100 different sender addresses they are all received by our updates@example.com e-mail address successfully.
Sebastian King
Posted 2015-04-14T23:14:57.877
Reputation: 23
To be honest I'm not 100% sure if superuser is the right place for this question, but I couldn't think of any other stackexchange site that was appropriate. – Sebastian King – 2015-04-14T23:15:32.647
Have you considered sending SMS messages directly/yourself? – AnFi – 2015-04-15T07:44:59.247
No, 100 a week was just the example. Realistically we send between 1000-5000 a week to all users, and the messages have to be delivered instantly when triggered by user's events. However, for one single AT&T it is perfectly realistic to say they may receive only 100 in a week. – Sebastian King – 2015-04-15T20:46:47.413