Error only occurs with version 25.4, rolled back to 25.3 and no issue.
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zc2DLITKzSR9Mdy72vfhu_mo8IKdIjnP3tmEYsS8=(Exception #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zcT35dojx_sCZW9SJNSF5Bl7pijrp(Object #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=z6VdY58mFv4GQ6wPep3wrAhwcNR8KnBtcZw==(#=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY= #=z3Ty9vzw=, #=qV5U2i4xFADDV3yYtmgaOkZtjbA9les2KIajiRXH2DII= #=zTvRxSkk=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=z2uZXcTWOHDab3MgwokwKIcik262r() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zXKta3Vg0I8XyBgzmaqGLOJoCmQLp(Boolean #=z3Ty9vzw=) — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zc2DLITKzSR9Mdy72vfhu_mo8IKdIjnP3tmEYsS8=(Exception #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zcT35dojx_sCZW9SJNSF5Bl7pijrp(Object #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zowlfK6pMb9qyGvhcXgTTIFSTi4m3() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=z8TK8IRDE4z0g0312nqNyIr4Og_2HcMPgBw==(#=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY= #=z3Ty9vzw=, #=qV5U2i4xFADDV3yYtmgaOkZtjbA9les2KIajiRXH2DII= #=zTvRxSkk=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=z2uZXcTWOHDab3MgwokwKIcik262r() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zXKta3Vg0I8XyBgzmaqGLOJoCmQLp(Boolean #=z3Ty9vzw=) — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zc2DLITKzSR9Mdy72vfhu_mo8IKdIjnP3tmEYsS8=(Exception #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zcT35dojx_sCZW9SJNSF5Bl7pijrp(Object #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zowlfK6pMb9qyGvhcXgTTIFSTi4m3() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zPJ5DP8ZwDKvo3fO7MCDmP__hP87SbkUnPgSMVw4=(Object #=z3Ty9vzw=, UInt32 #=zTvRxSkk=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zXKta3Vg0I8XyBgzmaqGLOJoCmQLp(Boolean #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zXKta3Vg0I8XyBgzmaqGLOJoCmQLp(Boolean #=z3Ty9vzw=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zwv7YfAB03MQcwrp32g2v7P0FVoFSPCTVfCuWewp6dGBw() at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=za3B1chCbofjotZ_7sbz_IAn8uCFBlnc4ZxL_YB7MzKOz(Object[] #=z3Ty9vzw=, Type[] #=zTvRxSkk=, Type[] #=zbVle6rk=, Object[] #=zXe_Jc_U=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zhrUADIb3IGVNgjFyXwCnF2_VJdJsGB_UcyJ6Ms8=(Stream #=z3Ty9vzw=, String #=zTvRxSkk=, Object[] #=zbVle6rk=, Type[] #=zXe_Jc_U=, Type[] #=zSGMJZNc=, Object[] #=zWV29Jus=) at #=qaZ1xMXqCYtFeDGhG8UEKs7qtpIOlrA6JLUcrPbLW2hY=.#=zfQT1KZHWYwpLQ12w8p79MUI=(Stream #=z3Ty9vzw=, String #=zTvRxSkk=, Object[] #=zbVle6rk=) at Aspose.Email.MailMessage.#=z365l5Ok=(Stream #=zrfFiqhk=, EmlLoadOptions #=zhl87mf4=) at Aspose.Email.MailMessage.#=zyTtw9qx_YXZf(Stream #=zrfFiqhk=, EmlLoadOptions #=zhl87mf4=) at Aspose.Email.MailMessage.#=zQyChJ5G0zYO3(Stream #=zrfFiqhk=, LoadOptions #=zhl87mf4=)