Allow SMTP HELO Hostname to be manually specified. (#62)

README.md

@@ -220,9 +220,10 @@ builder:
   port: int # Port of the GSB server
 
 recipes:
-  toAddr: Optional[str]   # Address to which recipe requests will be sent.
-  fromAddr: Optional[str] # Address from which recipe requests will be sent.
-  smtp: Optional[str]     # Address to an SMTP relay
+  toAddr: Optional[str]        # Address to which recipe requests will be sent.
+  fromAddr: Optional[str]      # Address from which recipe requests will be sent.
+  smtp: Optional[str]          # Address to an SMTP relay
+  localHostname: Optional[str] # Hostname to use for SMTP HELO.
 ```
 
 ## Usage

softpack_core/config/models.py

@@ -86,3 +86,4 @@ class RecipeConfig(BaseModel):
     toAddr: Optional[str]
     fromAddr: Optional[str]
     smtp: Optional[str]
+    localHostname: Optional[str]

softpack_core/service.py

@@ -193,7 +193,13 @@ async def request_recipe(  # type: ignore[no-untyped-def]
             msg["From"] = recipeConfig["fromAddr"]
             msg["To"] = recipeConfig["toAddr"]
 
-            s = smtplib.SMTP(recipeConfig["smtp"])
+            localhostname = None
+
+            if recipeConfig["localHostname"] is not None:
+                localhostname = recipeConfig["localHostname"]
+
+
+            s = smtplib.SMTP(recipeConfig["smtp"], local_hostname=localhostname)
             s.sendmail(
                 recipeConfig["fromAddr"],
                 [recipeConfig["toAddr"]],