Android 6.0 sms problems

Hi, since I have updated to Android 6.0 I realized that some people don’t receive any of my sms even though my app shows me that the sms were sent. Others receive them without any problems. I have no problem with receiving sms (as far as I know). It seems to be independent from the recipient’s mobile network provider. Can somebody help me, please?
By the way the sms app looks different now (blue icon with white bubble), but I guess it is because of the new system?!

Seems to be solved (for now). Don’t know how… Thanks, anyway!

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