Implement & link m_mail_check[_ovl].c

config/rel_slices.yml

@@ -79,6 +79,8 @@ m_mail.c:
     .text: [0x803BC70C, 0x803BD230]
     .data: [0x80656670, 0x806566C0]
     .bss: [0x81297CD0, 0x81297E68]
+m_mail_check.c:
+    .text: [0x803BD230, 0x803BD250]
 m_mail_password_check.c:
     .text: [0x803BD250, 0x803BEC9C]
     .data: [0x806566C0, 0x806571D8]
@@ -255,6 +257,9 @@ m_random_field/mRF_MakePerfectBit.c:
     .text: [0x8050B1AC, 0x8050B1D4]
 m_random_field/mRF_GetRandomStepMode.c:
     .text: [0x8050B284, 0x8050B2C0]
+m_mail_check_ovl.c:
+    .text: [0x8050F06C, 0x8050F838]
+    .data: [0x8069F320, 0x8069FA40]
 ac_douzou.c:
     .text: [0x805AD6D8, 0x805AE704]
     .rodata: [0x8064A7C0, 0x8064A7E8]