MAC MAIL falsche emailadresse und returnadresse aber nur sporadisch

Hallo habe einen Rechenr mit dem aktuellen MAC OS und dort wird der Apple Mail client verwendet

ein email acocunt (GMAIL) ist angelegt und wird benutzt.
Früher war noch ein xxx.edu account angelegt aber inaktiv markiert


Offensichtlich sporadisch wird mit dem inaktiven edu accout versendet (sender und Returnadresse)

z.B. vor fünf Tagen normale emeial mit Anhang per edu adresse, 2 Tage später ohne dazutun, etc. dann alles wie eingestellt per GMAIL.

Die Mail edu ist aber bei gmail als versandt zu sehen

Ich pack mal die beiden Headers mit rein :

Der erste Header ist vom 29 Juni alles OK
Der zweite Header vom 26 Juni mit eben der edu adresse was dann am 29 wie von Geiterhand veschwunden und am 26 hätte eigentlich nie erscheinen dürfen

Danke wenn hier jemand einen Tip dazu hat wie es dazu kommt .


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Gleicher Rechner (MAC MAIL), gleiche Einstellung ein paar Tage zuvor aber mit völlig anderer Absender und Returnadresse, Versandt zwar via gmail Adresse, wo sind solche Einstellungen versteckt die sich wie von selber aktivieren/ändern ?


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