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Hello what does the bounce message say please?
When it says recipient failed permanently it means there was an issue with the recipients mailbox, not linked to you or your email account. At times it can be their mailbox is full, your message with the photos was too large, or their account does not exist.
Another cause may be that your actually blacklisted by their Spam Filters or a service such as Spamhaus.
First, try sending them just one photo, and tell me please if you still get the error.
Let me know please.