Hi Juan,
I suggest you to check SAP Notes on this as in most of the case this stringindexout exception is related to code correction which needs of applying some patch.
Some of them are :
1942219 - PI Mail Adapter throws java.lang.ArrayIndexOutOfBound
2045679 - NullPointerException in Mail Sender Adapter using POP3 protocol
1727079 - java.lang.IndexOutOfBoundsException in Mail-Sender-Channel
Br,
Manoj
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