# Opflags

> [HTML Version](opflags.htm)

_opflags  _([Num](num.htm.md))  specifies various operation flags, using the sum of one or more of the following:

| **Symbol** | **Value** | **Type** | **Description** |
|------|------|------|------|
| EMF\_NORMAL | 0 | B,2 | normal operation |
| EMF\_LEAVEOPEN | 1 | B,2 | don't close session |
| EMF\_ALREADYOPEN | 2 | B,2 | don't open; (already open) |
| EMF\_OPENONLY | 4 | B,2 | open only; ignore all but SERVER \& HOST |
| EMF\_CLOSEONLY | 8 | B,2 | close only |
| EMF\_HDRCAT | 16 | B,2 | concatenate HEADER+BODY (no CRLF) |
| EMF\_HTMLBODY | 32 | B,2 | BODY contains <HTML> |
| EMF\_MIMEBODY | 64 |  | BODY is a self-contained MIME part |
| EMF\_TLS | 1024 |  | Use SSL/TLS for SMTP connection |
| EMF\_STARTTLS | 2048 |  | Use STARTTLS (start with unencrypted connection, then elevate to TLS with the STARTTLS SMTP command) |
| **Definition file: **[emailx.def](https://bitbucket.org/microsabio/soslib/src/master/907016/emailx.def) | | | 



Note that in most cases you can get by with EMF\_NORMAL. The next four flags (EMF\_LEAVEOPEN, EMF\_ALREADYOPEN, EMF\_OPENONLY, and EMF\_CLOSEONLY) are only of interest if you are sending a lot of emails in a batch and want to eliminate the overhead of having to open and close the connection with the SMTP server for each message. EMF\_HDRCAT is only used when you want to include email header items in both the _header _and _body _parameters. And EMF\_HTMLBODY is only recommended when you have used your own HTML formatting within the body of your message.