| Constant | Description | Possible Values |
|---|
| SMTPc_CFG_MBOX_NAME_DISP_LEN | This value corresponds to the maximum length of the displayed same associated with a mailbox, including ‘\0’. | This length must be smaller than 600 in order to respect the Internet Message size limit (see RFC 2821 for more details on this limit). This length has a direct impact on the SMTPc_MBOX structure size, and as a rule of thumb, it should be as small as possible in order to preserve memory. |
SMTPc_CFG_MSG_SUBJECT_LEN | This value sets the maximum length of the string containing the mail subject, including ‘\0’. | This value must be smaller than 900, for the same reason cited above. |
| SMTPc_CFG_MSG_MAX_TO | This value sets the maximum number of TO recipients. | Any integer value |
| SMTPc_CFG_MSG_MAX_CC | This value sets the maximum number of CC recipients. | Any integer value |
| SMTPc_CFG_MSG_MAX_BCC | This value sets the maximum number of BCC recipients. | Any integer value |
| SMTPc_CFG_MSG_MAX_ATTACH | This value sets the maximum number of message attached. | Any integer value |