mailx: add page

pages/common/mailx.md

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+# mailx
+
+> Send and receive mail.
+
+- To send mail, the content is typed after the command and ended with Control-D
+
+`mailx -s "{{subject}}" {{to_addr}}`
+
+- Send mail with short content.
+
+`echo "{{content}}" | mailx -s "{{subject}}" {{to_addr}}`
+
+- Send mail with content which written in a file.
+
+`mailx -s "{{subject}}" {{to_addr}} < {{content.txt}}`
+
+- Send mail to a recipient and CC to another address.
+
+`mailx -s "{{subject}}" -c {{cc_addr}} {{to_addr}}`
+
+- Send mail and set sender address.
+
+`mailx -s "{{subject}}" -r {{from_addr}} {{to_addr}}`
+
+- Send mail with an attachment.
+
+`mailx -a {{file}} -s "{{subject}}" {{to_addr}}`