diff --git a/lemarche/siaes/models.py b/lemarche/siaes/models.py
index 30e35e8fc..e3c159003 100644
--- a/lemarche/siaes/models.py
+++ b/lemarche/siaes/models.py
@@ -1083,6 +1083,10 @@ def contact_short_name(self):
             return f"{self.contact_first_name.upper()[:1]}. {self.contact_last_name.upper()}"
         return ""
 
+    @property
+    def contact_email_name_display(self):
+        return self.contact_full_name or self.name_display
+
     @property
     def contact_phone_display(self):
         return phone_number_display(self.contact_phone)
diff --git a/lemarche/www/conversations/tasks.py b/lemarche/www/conversations/tasks.py
index 11447b7de..5f7875884 100644
--- a/lemarche/www/conversations/tasks.py
+++ b/lemarche/www/conversations/tasks.py
@@ -11,7 +11,8 @@
 
 def send_first_email_from_conversation(conv: Conversation):
     siae: Siae = conv.siae
-    from_email = f"{conv.sender_first_name} {conv.sender_last_name} <{conv.sender_email_buyer_encoded}>"
+    from_name = f"{conv.sender_first_name} {conv.sender_last_name}"
+    from_email = f"{from_name} <{conv.sender_email_buyer_encoded}>"
 
     sender_company_name = ""
     if conv.sender_user and conv.sender_user.company_name:
@@ -38,7 +39,8 @@ def send_email_from_conversation(
 ):
     if user_kind == Conversation.USER_KIND_SENDER_TO_SIAE:
         # from the buyer to the siae
-        from_email = f"{conv.sender_first_name} {conv.sender_last_name} <{conv.sender_email_buyer_encoded}>"
+        from_name = f"{conv.sender_first_name} {conv.sender_last_name}"
+        from_email = f"{from_name} <{conv.sender_email_buyer_encoded}>"
         send_mail_async(
             email_subject=email_subject,
             email_body=email_body + DISCLAIMER_ATTACHMENTS,
@@ -49,7 +51,7 @@ def send_email_from_conversation(
     elif user_kind == Conversation.USER_KIND_SENDER_TO_BUYER:
         # from the siae to the buyer
         siae: Siae = conv.siae
-        from_email = f"{siae.contact_full_name} <{conv.sender_email_siae_encoded}>"
+        from_email = f"{siae.contact_email_name_display} <{conv.sender_email_siae_encoded}>"
         send_mail_async(
             email_subject=email_subject,
             email_body=email_body + DISCLAIMER_ATTACHMENTS,
diff --git a/lemarche/www/tenders/tasks.py b/lemarche/www/tenders/tasks.py
index 95bcfd306..243ddfa61 100644
--- a/lemarche/www/tenders/tasks.py
+++ b/lemarche/www/tenders/tasks.py
@@ -122,7 +122,7 @@ def send_tender_email_to_siae(tender: Tender, siae: Siae, email_subject: str, re
     recipient_list = whitelist_recipient_list([email_to])
     if len(recipient_list):
         recipient_email = recipient_list[0]
-        recipient_name = siae.contact_full_name
+        recipient_name = siae.contact_email_name_display
 
         tender_url = f"{get_object_share_url(tender)}?siae_id={siae.id}"
         tender_not_interested_url = f"{get_object_share_url(tender)}?siae_id={siae.id}&not_interested=True"
@@ -273,7 +273,7 @@ def send_tender_contacted_reminder_email_to_siae(tendersiae: TenderSiae, email_t
     recipient_list = whitelist_recipient_list([tendersiae.siae.contact_email])
     if len(recipient_list):
         recipient_email = recipient_list[0]
-        recipient_name = tendersiae.tender.author.full_name
+        recipient_name = tendersiae.siae.contact_email_name_display
 
         variables = {
             "SIAE_CONTACT_FIRST_NAME": tendersiae.siae.contact_first_name,
@@ -348,7 +348,7 @@ def send_tender_interested_reminder_email_to_siae(
     recipient_list = whitelist_recipient_list([tendersiae.siae.contact_email])
     if len(recipient_list):
         recipient_email = recipient_list[0]
-        recipient_name = tendersiae.tender.author.full_name
+        recipient_name = tendersiae.siae.contact_email_name_display
 
         variables = {
             "SIAE_CONTACT_FIRST_NAME": tendersiae.siae.contact_first_name,