doc: Add doc/config.md to document config for #86

- Increase default max message size to 10MB.

pkg/config/config.go

@@ -42,7 +42,7 @@ type SMTP struct {
 	Domain          string        `required:"true" default:"inbucket" desc:"HELO domain"`
 	DomainNoStore   string        `desc:"Load testing domain"`
 	MaxRecipients   int           `required:"true" default:"200" desc:"Maximum RCPT TO per message"`
-	MaxMessageBytes int           `required:"true" default:"2048000" desc:"Maximum message size"`
+	MaxMessageBytes int           `required:"true" default:"10240000" desc:"Maximum message size"`
 	StoreMessages   bool          `required:"true" default:"true" desc:"Store incoming mail?"`
 	Timeout         time.Duration `required:"true" default:"300s" desc:"Idle network timeout"`
 }

pkg/storage/mem/maxsize.go

@@ -7,8 +7,8 @@ type msgDone struct {
 	done chan struct{}
 }
 
-// enforceMaxSize will delete the oldest message until the entire mail store is equal to or less
-// than Store.maxSize bytes.
+// maxSizeEnforcer will delete the oldest message until the entire mail store is equal to or less
+// than maxSize bytes.
 func (s *Store) maxSizeEnforcer(maxSize int64) {
 	all := &list.List{}
 	curSize := int64(0)