Following are the solutions we tried
1.define the attachment folder path in general settings.
2.mount windows shared folder path with linux folder and configure the same windows path in general settings.
3.give full rights to windows shared folder path.
upon tried all the above solution now the email send without the attachment but the attachment is available in the windows share path and also available in mounted linux folder.
please provide a solution to send an email with attachment.
Thanks in advance.