boundary = NewStrBufPlain(HKEY("=_Citadel_Multipart_"));
StrBufAppendPrintf(boundary, "%s_%04x%04x", config.c_fqdn, getpid(), ++seq);
boundary = NewStrBufPlain(HKEY("=_Citadel_Multipart_"));
StrBufAppendPrintf(boundary, "%s_%04x%04x", config.c_fqdn, getpid(), ++seq);